diff --git a/chainable_api.go b/chainable_api.go
index cac7495d..432026cf 100644
--- a/chainable_api.go
+++ b/chainable_api.go
@@ -31,8 +31,8 @@ func (db *DB) Clauses(conds ...clause.Expression) (tx *DB) {
 	}
 
 	if len(whereConds) > 0 {
-		tx.Statement.AddClause(clause.Where{
-			AndConditions: tx.Statement.BuildCondtion(whereConds[0], whereConds[1:]...),
+		tx.Statement.AddClause(&clause.Where{
+			tx.Statement.BuildCondtion(whereConds[0], whereConds[1:]...),
 		})
 	}
 	return
@@ -59,8 +59,8 @@ func (db *DB) Omit(columns ...string) (tx *DB) {
 
 func (db *DB) Where(query interface{}, args ...interface{}) (tx *DB) {
 	tx = db.getInstance()
-	tx.Statement.AddClause(clause.Where{
-		AndConditions: tx.Statement.BuildCondtion(query, args...),
+	tx.Statement.AddClause(&clause.Where{
+		tx.Statement.BuildCondtion(query, args...),
 	})
 	return
 }
@@ -68,10 +68,8 @@ func (db *DB) Where(query interface{}, args ...interface{}) (tx *DB) {
 // Not add NOT condition
 func (db *DB) Not(query interface{}, args ...interface{}) (tx *DB) {
 	tx = db.getInstance()
-	tx.Statement.AddClause(clause.Where{
-		AndConditions: []clause.Expression{
-			clause.NotConditions(tx.Statement.BuildCondtion(query, args...)),
-		},
+	tx.Statement.AddClause(&clause.Where{
+		[]clause.Expression{clause.Not(tx.Statement.BuildCondtion(query, args...)...)},
 	})
 	return
 }
@@ -79,10 +77,8 @@ func (db *DB) Not(query interface{}, args ...interface{}) (tx *DB) {
 // Or add OR conditions
 func (db *DB) Or(query interface{}, args ...interface{}) (tx *DB) {
 	tx = db.getInstance()
-	tx.Statement.AddClause(clause.Where{
-		OrConditions: []clause.OrConditions{
-			tx.Statement.BuildCondtion(query, args...),
-		},
+	tx.Statement.AddClause(&clause.Where{
+		[]clause.Expression{clause.Or(tx.Statement.BuildCondtion(query, args...)...)},
 	})
 	return
 }
@@ -113,13 +109,13 @@ func (db *DB) Order(value interface{}) (tx *DB) {
 	tx = db.getInstance()
 
 	switch v := value.(type) {
-	case clause.OrderBy:
-		db.Statement.AddClause(clause.OrderByClause{
-			Columns: []clause.OrderBy{v},
+	case clause.OrderByColumn:
+		db.Statement.AddClause(clause.OrderBy{
+			Columns: []clause.OrderByColumn{v},
 		})
 	default:
-		db.Statement.AddClause(clause.OrderByClause{
-			Columns: []clause.OrderBy{{
+		db.Statement.AddClause(clause.OrderBy{
+			Columns: []clause.OrderByColumn{{
 				Column: clause.Column{Name: fmt.Sprint(value), Raw: true},
 			}},
 		})
diff --git a/clause/clause.go b/clause/clause.go
index 6d4698e9..df8e3a57 100644
--- a/clause/clause.go
+++ b/clause/clause.go
@@ -1,5 +1,26 @@
 package clause
 
+// Interface clause interface
+type Interface interface {
+	Name() string
+	Build(Builder)
+	MergeClause(*Clause)
+}
+
+// ClauseBuilder clause builder, allows to custmize how to build clause
+type ClauseBuilder interface {
+	Build(Clause, Builder)
+}
+
+// Builder builder interface
+type Builder interface {
+	WriteByte(byte) error
+	Write(sql ...string) error
+	WriteQuoted(field interface{}) error
+	AddVar(vars ...interface{}) string
+	Quote(field interface{}) string
+}
+
 // Clause
 type Clause struct {
 	Name                 string // WHERE
@@ -18,7 +39,7 @@ func (c Clause) Build(builder Builder) {
 	} else {
 		builders := c.BeforeExpressions
 		if c.Name != "" {
-			builders = append(builders, Expr{c.Name})
+			builders = append(builders, Expr{SQL: c.Name})
 		}
 
 		builders = append(builders, c.AfterNameExpressions...)
@@ -35,28 +56,27 @@ func (c Clause) Build(builder Builder) {
 	}
 }
 
-// Interface clause interface
-type Interface interface {
-	Name() string
-	Build(Builder)
-	MergeExpression(Expression)
+const (
+	PrimaryKey   string = "@@@priamry_key@@@"
+	CurrentTable string = "@@@table@@@"
+)
+
+var (
+	currentTable  = Table{Name: CurrentTable}
+	PrimaryColumn = Column{Table: CurrentTable, Name: PrimaryKey}
+)
+
+// Column quote with name
+type Column struct {
+	Table string
+	Name  string
+	Alias string
+	Raw   bool
 }
 
-// OverrideNameInterface override name interface
-type OverrideNameInterface interface {
-	OverrideName() string
-}
-
-// ClauseBuilder clause builder, allows to custmize how to build clause
-type ClauseBuilder interface {
-	Build(Clause, Builder)
-}
-
-// Builder builder interface
-type Builder interface {
-	WriteByte(byte) error
-	Write(sql ...string) error
-	WriteQuoted(field interface{}) error
-	AddVar(vars ...interface{}) string
-	Quote(field interface{}) string
+// Table quote with name
+type Table struct {
+	Name  string
+	Alias string
+	Raw   bool
 }
diff --git a/clause/clause_test.go b/clause/clause_test.go
index 37f07686..30ea9343 100644
--- a/clause/clause_test.go
+++ b/clause/clause_test.go
@@ -1,8 +1,8 @@
 package clause_test
 
 import (
-	"fmt"
 	"reflect"
+	"strings"
 	"sync"
 	"testing"
 
@@ -12,45 +12,32 @@ import (
 	"github.com/jinzhu/gorm/tests"
 )
 
-func TestClauses(t *testing.T) {
+var db, _ = gorm.Open(tests.DummyDialector{}, nil)
+
+func checkBuildClauses(t *testing.T, clauses []clause.Interface, result string, vars []interface{}) {
 	var (
-		db, _   = gorm.Open(tests.DummyDialector{}, nil)
-		results = []struct {
-			Clauses []clause.Interface
-			Result  string
-			Vars    []interface{}
-		}{
-			{
-				[]clause.Interface{clause.Select{}, clause.From{}, clause.Where{AndConditions: []clause.Expression{clause.Eq{Column: clause.PrimaryColumn, Value: "1"}}}},
-				"SELECT * FROM `users` WHERE `users`.`id` = ?", []interface{}{"1"},
-			},
-		}
+		buildNames    []string
+		buildNamesMap = map[string]bool{}
+		user, _       = schema.Parse(&tests.User{}, &sync.Map{}, db.NamingStrategy)
+		stmt          = gorm.Statement{DB: db, Table: user.Table, Schema: user, Clauses: map[string]clause.Clause{}}
 	)
 
-	for idx, result := range results {
-		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
-			var (
-				user, _ = schema.Parse(&tests.User{}, &sync.Map{}, db.NamingStrategy)
-				stmt    = gorm.Statement{
-					DB: db, Table: user.Table, Schema: user, Clauses: map[string]clause.Clause{},
-				}
-				buildNames []string
-			)
+	for _, c := range clauses {
+		if _, ok := buildNamesMap[c.Name()]; !ok {
+			buildNames = append(buildNames, c.Name())
+			buildNamesMap[c.Name()] = true
+		}
 
-			for _, c := range result.Clauses {
-				buildNames = append(buildNames, c.Name())
-				stmt.AddClause(c)
-			}
+		stmt.AddClause(c)
+	}
 
-			stmt.Build(buildNames...)
+	stmt.Build(buildNames...)
 
-			if stmt.SQL.String() != result.Result {
-				t.Errorf("SQL expects %v got %v", result.Result, stmt.SQL.String())
-			}
+	if strings.TrimSpace(stmt.SQL.String()) != result {
+		t.Errorf("SQL expects %v got %v", result, stmt.SQL.String())
+	}
 
-			if reflect.DeepEqual(stmt.Vars, result.Vars) {
-				t.Errorf("Vars expects %+v got %v", stmt.Vars, result.Vars)
-			}
-		})
+	if !reflect.DeepEqual(stmt.Vars, vars) {
+		t.Errorf("Vars expects %+v got %v", stmt.Vars, vars)
 	}
 }
diff --git a/clause/delete.go b/clause/delete.go
new file mode 100644
index 00000000..2a622b45
--- /dev/null
+++ b/clause/delete.go
@@ -0,0 +1,23 @@
+package clause
+
+type Delete struct {
+	Modifier string
+}
+
+func (d Delete) Name() string {
+	return "DELETE"
+}
+
+func (d Delete) Build(builder Builder) {
+	builder.Write("DELETE")
+
+	if d.Modifier != "" {
+		builder.WriteByte(' ')
+		builder.Write(d.Modifier)
+	}
+}
+
+func (d Delete) MergeClause(clause *Clause) {
+	clause.Name = ""
+	clause.Expression = d
+}
diff --git a/clause/delete_test.go b/clause/delete_test.go
new file mode 100644
index 00000000..2faf8364
--- /dev/null
+++ b/clause/delete_test.go
@@ -0,0 +1,31 @@
+package clause_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/jinzhu/gorm/clause"
+)
+
+func TestDelete(t *testing.T) {
+	results := []struct {
+		Clauses []clause.Interface
+		Result  string
+		Vars    []interface{}
+	}{
+		{
+			[]clause.Interface{clause.Delete{}, clause.From{}},
+			"DELETE FROM `users`", nil,
+		},
+		{
+			[]clause.Interface{clause.Delete{Modifier: "LOW_PRIORITY"}, clause.From{}},
+			"DELETE LOW_PRIORITY FROM `users`", nil,
+		},
+	}
+
+	for idx, result := range results {
+		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
+			checkBuildClauses(t, result.Clauses, result.Result, result.Vars)
+		})
+	}
+}
diff --git a/clause/expression.go b/clause/expression.go
index 3ddc146d..048b0980 100644
--- a/clause/expression.go
+++ b/clause/expression.go
@@ -1,14 +1,6 @@
 package clause
 
-const (
-	PrimaryKey   string = "@@@priamry_key@@@"
-	CurrentTable string = "@@@table@@@"
-)
-
-var PrimaryColumn = Column{
-	Table: CurrentTable,
-	Name:  PrimaryKey,
-}
+import "strings"
 
 // Expression expression interface
 type Expression interface {
@@ -20,27 +12,155 @@ type NegationExpressionBuilder interface {
 	NegationBuild(builder Builder)
 }
 
-// Column quote with name
-type Column struct {
-	Table string
-	Name  string
-	Alias string
-	Raw   bool
-}
-
-// Table quote with name
-type Table struct {
-	Table string
-	Alias string
-	Raw   bool
-}
-
 // Expr raw expression
 type Expr struct {
-	Value string
+	SQL  string
+	Vars []interface{}
 }
 
 // Build build raw expression
 func (expr Expr) Build(builder Builder) {
-	builder.Write(expr.Value)
+	sql := expr.SQL
+	for _, v := range expr.Vars {
+		sql = strings.Replace(sql, " ? ", " "+builder.AddVar(v)+" ", 1)
+	}
+	builder.Write(sql)
+}
+
+// IN Whether a value is within a set of values
+type IN struct {
+	Column interface{}
+	Values []interface{}
+}
+
+func (in IN) Build(builder Builder) {
+	builder.WriteQuoted(in.Column)
+
+	switch len(in.Values) {
+	case 0:
+		builder.Write(" IN (NULL)")
+	case 1:
+		builder.Write(" = ", builder.AddVar(in.Values...))
+	default:
+		builder.Write(" IN (", builder.AddVar(in.Values...), ")")
+	}
+}
+
+func (in IN) NegationBuild(builder Builder) {
+	switch len(in.Values) {
+	case 0:
+	case 1:
+		builder.Write(" <> ", builder.AddVar(in.Values...))
+	default:
+		builder.Write(" NOT IN (", builder.AddVar(in.Values...), ")")
+	}
+}
+
+// Eq equal to for where
+type Eq struct {
+	Column interface{}
+	Value  interface{}
+}
+
+func (eq Eq) Build(builder Builder) {
+	builder.WriteQuoted(eq.Column)
+
+	if eq.Value == nil {
+		builder.Write(" IS NULL")
+	} else {
+		builder.Write(" = ", builder.AddVar(eq.Value))
+	}
+}
+
+func (eq Eq) NegationBuild(builder Builder) {
+	Neq{eq.Column, eq.Value}.Build(builder)
+}
+
+// Neq not equal to for where
+type Neq Eq
+
+func (neq Neq) Build(builder Builder) {
+	builder.WriteQuoted(neq.Column)
+
+	if neq.Value == nil {
+		builder.Write(" IS NOT NULL")
+	} else {
+		builder.Write(" <> ", builder.AddVar(neq.Value))
+	}
+}
+
+func (neq Neq) NegationBuild(builder Builder) {
+	Eq{neq.Column, neq.Value}.Build(builder)
+}
+
+// Gt greater than for where
+type Gt Eq
+
+func (gt Gt) Build(builder Builder) {
+	builder.WriteQuoted(gt.Column)
+	builder.Write(" > ", builder.AddVar(gt.Value))
+}
+
+func (gt Gt) NegationBuild(builder Builder) {
+	Lte{gt.Column, gt.Value}.Build(builder)
+}
+
+// Gte greater than or equal to for where
+type Gte Eq
+
+func (gte Gte) Build(builder Builder) {
+	builder.WriteQuoted(gte.Column)
+	builder.Write(" >= ", builder.AddVar(gte.Value))
+}
+
+func (gte Gte) NegationBuild(builder Builder) {
+	Lt{gte.Column, gte.Value}.Build(builder)
+}
+
+// Lt less than for where
+type Lt Eq
+
+func (lt Lt) Build(builder Builder) {
+	builder.WriteQuoted(lt.Column)
+	builder.Write(" < ", builder.AddVar(lt.Value))
+}
+
+func (lt Lt) NegationBuild(builder Builder) {
+	Gte{lt.Column, lt.Value}.Build(builder)
+}
+
+// Lte less than or equal to for where
+type Lte Eq
+
+func (lte Lte) Build(builder Builder) {
+	builder.WriteQuoted(lte.Column)
+	builder.Write(" <= ", builder.AddVar(lte.Value))
+}
+
+func (lte Lte) NegationBuild(builder Builder) {
+	Gt{lte.Column, lte.Value}.Build(builder)
+}
+
+// Like whether string matches regular expression
+type Like Eq
+
+func (like Like) Build(builder Builder) {
+	builder.WriteQuoted(like.Column)
+	builder.Write(" LIKE ", builder.AddVar(like.Value))
+}
+
+func (like Like) NegationBuild(builder Builder) {
+	builder.WriteQuoted(like.Column)
+	builder.Write(" NOT LIKE ", builder.AddVar(like.Value))
+}
+
+// Map
+type Map map[interface{}]interface{}
+
+func (m Map) Build(builder Builder) {
+	// TODO
+}
+
+func (m Map) NegationBuild(builder Builder) {
+	// TODO
 }
diff --git a/clause/from.go b/clause/from.go
index b7665bc3..f01065b5 100644
--- a/clause/from.go
+++ b/clause/from.go
@@ -3,15 +3,31 @@ package clause
 // From from clause
 type From struct {
 	Tables []Table
+	Joins  []Join
+}
+
+type JoinType string
+
+const (
+	CrossJoin JoinType = "CROSS"
+	InnerJoin          = "INNER"
+	LeftJoin           = "LEFT"
+	RightJoin          = "RIGHT"
+)
+
+// Join join clause for from
+type Join struct {
+	Type  JoinType
+	Table Table
+	ON    Where
+	Using []string
 }
 
 // Name from clause name
-func (From) Name() string {
+func (from From) Name() string {
 	return "FROM"
 }
 
-var currentTable = Table{Table: CurrentTable}
-
 // Build build from clause
 func (from From) Build(builder Builder) {
 	if len(from.Tables) > 0 {
@@ -25,11 +41,42 @@ func (from From) Build(builder Builder) {
 	} else {
 		builder.WriteQuoted(currentTable)
 	}
-}
 
-// MergeExpression merge order by clauses
-func (from From) MergeExpression(expr Expression) {
-	if v, ok := expr.(From); ok {
-		from.Tables = append(v.Tables, from.Tables...)
+	for _, join := range from.Joins {
+		builder.WriteByte(' ')
+		join.Build(builder)
 	}
 }
+
+func (join Join) Build(builder Builder) {
+	if join.Type != "" {
+		builder.Write(string(join.Type))
+		builder.WriteByte(' ')
+	}
+
+	builder.Write("JOIN ")
+	builder.WriteQuoted(join.Table)
+
+	if len(join.ON.Exprs) > 0 {
+		builder.Write(" ON ")
+		join.ON.Build(builder)
+	} else if len(join.Using) > 0 {
+		builder.Write(" USING (")
+		for idx, c := range join.Using {
+			if idx > 0 {
+				builder.WriteByte(',')
+			}
+			builder.WriteQuoted(c)
+		}
+		builder.WriteByte(')')
+	}
+}
+
+// MergeClause merge from clause
+func (from From) MergeClause(clause *Clause) {
+	if v, ok := clause.Expression.(From); ok {
+		from.Tables = append(v.Tables, from.Tables...)
+		from.Joins = append(v.Joins, from.Joins...)
+	}
+	clause.Expression = from
+}
diff --git a/clause/from_test.go b/clause/from_test.go
new file mode 100644
index 00000000..4b7b0e18
--- /dev/null
+++ b/clause/from_test.go
@@ -0,0 +1,75 @@
+package clause_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/jinzhu/gorm/clause"
+)
+
+func TestFrom(t *testing.T) {
+	results := []struct {
+		Clauses []clause.Interface
+		Result  string
+		Vars    []interface{}
+	}{
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}},
+			"SELECT * FROM `users`", nil,
+		},
+		{
+			[]clause.Interface{
+				clause.Select{}, clause.From{
+					Tables: []clause.Table{{Name: "users"}},
+					Joins: []clause.Join{
+						{
+							Type:  clause.InnerJoin,
+							Table: clause.Table{Name: "articles"},
+							ON: clause.Where{
+								[]clause.Expression{clause.Eq{clause.Column{Table: "articles", Name: "id"}, clause.PrimaryColumn}},
+							},
+						},
+					},
+				},
+			},
+			"SELECT * FROM `users` INNER JOIN `articles` ON `articles`.`id` = `users`.`id`", nil,
+		},
+		{
+			[]clause.Interface{
+				clause.Select{}, clause.From{
+					Tables: []clause.Table{{Name: "users"}},
+					Joins: []clause.Join{
+						{
+							Type:  clause.InnerJoin,
+							Table: clause.Table{Name: "articles"},
+							ON: clause.Where{
+								[]clause.Expression{clause.Eq{clause.Column{Table: "articles", Name: "id"}, clause.PrimaryColumn}},
+							},
+						}, {
+							Type:  clause.LeftJoin,
+							Table: clause.Table{Name: "companies"},
+							Using: []string{"company_name"},
+						},
+					},
+				}, clause.From{
+					Joins: []clause.Join{
+						{
+							Type:  clause.RightJoin,
+							Table: clause.Table{Name: "profiles"},
+							ON: clause.Where{
+								[]clause.Expression{clause.Eq{clause.Column{Table: "profiles", Name: "email"}, clause.Column{Table: clause.CurrentTable, Name: "email"}}},
+							},
+						},
+					},
+				},
+			},
+			"SELECT * FROM `users` INNER JOIN `articles` ON `articles`.`id` = `users`.`id` LEFT JOIN `companies` USING (`company_name`) RIGHT JOIN `profiles` ON `profiles`.`email` = `users`.`email`", nil,
+		},
+	}
+
+	for idx, result := range results {
+		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
+			checkBuildClauses(t, result.Clauses, result.Result, result.Vars)
+		})
+	}
+}
diff --git a/clause/group_by.go b/clause/group_by.go
index bce94109..8d164731 100644
--- a/clause/group_by.go
+++ b/clause/group_by.go
@@ -2,5 +2,36 @@ package clause
 
 // GroupBy group by clause
 type GroupBy struct {
-	Having Where
+	Columns []Column
+	Having  Where
+}
+
+// Name from clause name
+func (groupBy GroupBy) Name() string {
+	return "GROUP BY"
+}
+
+// Build build group by clause
+func (groupBy GroupBy) Build(builder Builder) {
+	for idx, column := range groupBy.Columns {
+		if idx > 0 {
+			builder.WriteByte(',')
+		}
+
+		builder.WriteQuoted(column)
+	}
+
+	if len(groupBy.Having.Exprs) > 0 {
+		builder.Write(" HAVING ")
+		groupBy.Having.Build(builder)
+	}
+}
+
+// MergeClause merge group by clause
+func (groupBy GroupBy) MergeClause(clause *Clause) {
+	if v, ok := clause.Expression.(GroupBy); ok {
+		groupBy.Columns = append(v.Columns, groupBy.Columns...)
+		groupBy.Having.Exprs = append(v.Having.Exprs, groupBy.Having.Exprs...)
+	}
+	clause.Expression = groupBy
 }
diff --git a/clause/group_by_test.go b/clause/group_by_test.go
new file mode 100644
index 00000000..35be84a4
--- /dev/null
+++ b/clause/group_by_test.go
@@ -0,0 +1,40 @@
+package clause_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/jinzhu/gorm/clause"
+)
+
+func TestGroupBy(t *testing.T) {
+	results := []struct {
+		Clauses []clause.Interface
+		Result  string
+		Vars    []interface{}
+	}{
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.GroupBy{
+				Columns: []clause.Column{{Name: "role"}},
+				Having:  clause.Where{[]clause.Expression{clause.Eq{"role", "admin"}}},
+			}},
+			"SELECT * FROM `users` GROUP BY `role` HAVING `role` = ?", []interface{}{"admin"},
+		},
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.GroupBy{
+				Columns: []clause.Column{{Name: "role"}},
+				Having:  clause.Where{[]clause.Expression{clause.Eq{"role", "admin"}}},
+			}, clause.GroupBy{
+				Columns: []clause.Column{{Name: "gender"}},
+				Having:  clause.Where{[]clause.Expression{clause.Neq{"gender", "U"}}},
+			}},
+			"SELECT * FROM `users` GROUP BY `role`,`gender` HAVING `role` = ? AND `gender` <> ?", []interface{}{"admin", "U"},
+		},
+	}
+
+	for idx, result := range results {
+		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
+			checkBuildClauses(t, result.Clauses, result.Result, result.Vars)
+		})
+	}
+}
diff --git a/clause/insert.go b/clause/insert.go
index e056b35e..3f86c98f 100644
--- a/clause/insert.go
+++ b/clause/insert.go
@@ -2,7 +2,7 @@ package clause
 
 type Insert struct {
 	Table    Table
-	Priority string
+	Modifier string
 }
 
 // Name insert clause name
@@ -12,23 +12,28 @@ func (insert Insert) Name() string {
 
 // Build build insert clause
 func (insert Insert) Build(builder Builder) {
-	if insert.Priority != "" {
-		builder.Write(insert.Priority)
+	if insert.Modifier != "" {
+		builder.Write(insert.Modifier)
 		builder.WriteByte(' ')
 	}
 
 	builder.Write("INTO ")
-	builder.WriteQuoted(insert.Table)
+	if insert.Table.Name == "" {
+		builder.WriteQuoted(currentTable)
+	} else {
+		builder.WriteQuoted(insert.Table)
+	}
 }
 
-// MergeExpression merge insert clauses
-func (insert Insert) MergeExpression(expr Expression) {
-	if v, ok := expr.(Insert); ok {
-		if insert.Priority == "" {
-			insert.Priority = v.Priority
+// MergeClause merge insert clause
+func (insert Insert) MergeClause(clause *Clause) {
+	if v, ok := clause.Expression.(Insert); ok {
+		if insert.Modifier == "" {
+			insert.Modifier = v.Modifier
 		}
-		if insert.Table.Table == "" {
+		if insert.Table.Name == "" {
 			insert.Table = v.Table
 		}
 	}
+	clause.Expression = insert
 }
diff --git a/clause/insert_test.go b/clause/insert_test.go
new file mode 100644
index 00000000..b1a57803
--- /dev/null
+++ b/clause/insert_test.go
@@ -0,0 +1,35 @@
+package clause_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/jinzhu/gorm/clause"
+)
+
+func TestInsert(t *testing.T) {
+	results := []struct {
+		Clauses []clause.Interface
+		Result  string
+		Vars    []interface{}
+	}{
+		{
+			[]clause.Interface{clause.Insert{}},
+			"INSERT INTO `users`", nil,
+		},
+		{
+			[]clause.Interface{clause.Insert{Modifier: "LOW_PRIORITY"}},
+			"INSERT LOW_PRIORITY INTO `users`", nil,
+		},
+		{
+			[]clause.Interface{clause.Insert{Table: clause.Table{Name: "products"}, Modifier: "LOW_PRIORITY"}},
+			"INSERT LOW_PRIORITY INTO `products`", nil,
+		},
+	}
+
+	for idx, result := range results {
+		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
+			checkBuildClauses(t, result.Clauses, result.Result, result.Vars)
+		})
+	}
+}
diff --git a/clause/join.go b/clause/join.go
deleted file mode 100644
index 6b0e8f97..00000000
--- a/clause/join.go
+++ /dev/null
@@ -1,23 +0,0 @@
-package clause
-
-// Join join clause
-type Join struct {
-	Table From   // From
-	Type  string // INNER, LEFT, RIGHT, FULL, CROSS JOIN
-	Using []Column
-	ON    Where
-}
-
-// TODO multiple joins
-
-func (join Join) Build(builder Builder) {
-	// TODO
-}
-
-func (join Join) MergeExpression(expr Expression) {
-	// if j, ok := expr.(Join); ok {
-	// 	join.builders = append(join.builders, j.builders...)
-	// } else {
-	// 	join.builders = append(join.builders, expr)
-	// }
-}
diff --git a/clause/limit.go b/clause/limit.go
index 8fbc0055..7b16f339 100644
--- a/clause/limit.go
+++ b/clause/limit.go
@@ -1,6 +1,44 @@
 package clause
 
+import "strconv"
+
 // Limit limit clause
 type Limit struct {
-	Offset uint
+	Limit  int
+	Offset int
+}
+
+// Name where clause name
+func (limit Limit) Name() string {
+	return "LIMIT"
+}
+
+// Build build where clause
+func (limit Limit) Build(builder Builder) {
+	if limit.Limit > 0 {
+		builder.Write("LIMIT ")
+		builder.Write(strconv.Itoa(limit.Limit))
+
+		if limit.Offset > 0 {
+			builder.Write(" OFFSET ")
+			builder.Write(strconv.Itoa(limit.Offset))
+		}
+	}
+}
+
+// MergeClause merge order by clauses
+func (limit Limit) MergeClause(clause *Clause) {
+	clause.Name = ""
+
+	if v, ok := clause.Expression.(Limit); ok {
+		if limit.Limit == 0 && v.Limit > 0 {
+			limit.Limit = v.Limit
+		}
+
+		if limit.Offset == 0 && v.Offset > 0 {
+			limit.Offset = v.Offset
+		}
+	}
+
+	clause.Expression = limit
 }
diff --git a/clause/limit_test.go b/clause/limit_test.go
new file mode 100644
index 00000000..7b76aaf4
--- /dev/null
+++ b/clause/limit_test.go
@@ -0,0 +1,46 @@
+package clause_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/jinzhu/gorm/clause"
+)
+
+func TestLimit(t *testing.T) {
+	results := []struct {
+		Clauses []clause.Interface
+		Result  string
+		Vars    []interface{}
+	}{
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.Limit{
+				Limit:  10,
+				Offset: 20,
+			}},
+			"SELECT * FROM `users` LIMIT 10 OFFSET 20", nil,
+		},
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.Limit{Limit: 10, Offset: 20}, clause.Limit{Offset: 30}},
+			"SELECT * FROM `users` LIMIT 10 OFFSET 30", nil,
+		},
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.Limit{Limit: 10, Offset: 20}, clause.Limit{Offset: 30}, clause.Limit{Offset: -10}},
+			"SELECT * FROM `users` LIMIT 10", nil,
+		},
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.Limit{Limit: 10, Offset: 20}, clause.Limit{Offset: 30}, clause.Limit{Limit: -10}},
+			"SELECT * FROM `users`", nil,
+		},
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.Limit{Limit: 10, Offset: 20}, clause.Limit{Offset: 30}, clause.Limit{Limit: 50}},
+			"SELECT * FROM `users` LIMIT 50 OFFSET 30", nil,
+		},
+	}
+
+	for idx, result := range results {
+		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
+			checkBuildClauses(t, result.Clauses, result.Result, result.Vars)
+		})
+	}
+}
diff --git a/clause/locking.go b/clause/locking.go
new file mode 100644
index 00000000..48b84b34
--- /dev/null
+++ b/clause/locking.go
@@ -0,0 +1,48 @@
+package clause
+
+type For struct {
+	Lockings []Locking
+}
+
+type Locking struct {
+	Strength string
+	Table    Table
+	Options  string
+}
+
+// Name where clause name
+func (f For) Name() string {
+	return "FOR"
+}
+
+// Build build where clause
+func (f For) Build(builder Builder) {
+	for idx, locking := range f.Lockings {
+		if idx > 0 {
+			builder.WriteByte(' ')
+		}
+
+		builder.Write("FOR ")
+		builder.Write(locking.Strength)
+		if locking.Table.Name != "" {
+			builder.Write(" OF ")
+			builder.WriteQuoted(locking.Table)
+		}
+
+		if locking.Options != "" {
+			builder.WriteByte(' ')
+			builder.Write(locking.Options)
+		}
+	}
+}
+
+// MergeClause merge order by clauses
+func (f For) MergeClause(clause *Clause) {
+	clause.Name = ""
+
+	if v, ok := clause.Expression.(For); ok {
+		f.Lockings = append(v.Lockings, f.Lockings...)
+	}
+
+	clause.Expression = f
+}
diff --git a/clause/locking_test.go b/clause/locking_test.go
new file mode 100644
index 00000000..6b054404
--- /dev/null
+++ b/clause/locking_test.go
@@ -0,0 +1,43 @@
+package clause_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/jinzhu/gorm/clause"
+)
+
+func TestFor(t *testing.T) {
+	results := []struct {
+		Clauses []clause.Interface
+		Result  string
+		Vars    []interface{}
+	}{
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.For{
+				Lockings: []clause.Locking{{Strength: "UPDATE"}},
+			}},
+			"SELECT * FROM `users` FOR UPDATE", nil,
+		},
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.For{
+				Lockings: []clause.Locking{{Strength: "UPDATE"}, {Strength: "SHARE", Table: clause.Table{Name: clause.CurrentTable}}},
+			}},
+			"SELECT * FROM `users` FOR UPDATE FOR SHARE OF `users`", nil,
+		},
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.For{
+				Lockings: []clause.Locking{{Strength: "UPDATE"}, {Strength: "SHARE", Table: clause.Table{Name: clause.CurrentTable}}},
+			}, clause.For{
+				Lockings: []clause.Locking{{Strength: "UPDATE", Options: "NOWAIT"}},
+			}},
+			"SELECT * FROM `users` FOR UPDATE FOR SHARE OF `users` FOR UPDATE NOWAIT", nil,
+		},
+	}
+
+	for idx, result := range results {
+		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
+			checkBuildClauses(t, result.Clauses, result.Result, result.Vars)
+		})
+	}
+}
diff --git a/clause/on_conflict.go b/clause/on_conflict.go
deleted file mode 100644
index 5cbe3dd7..00000000
--- a/clause/on_conflict.go
+++ /dev/null
@@ -1,6 +0,0 @@
-package clause
-
-type OnConflict struct {
-	ON     string  // duplicate key
-	Values *Values // update c=c+1
-}
diff --git a/clause/order_by.go b/clause/order_by.go
index 6025e1ba..2734f2bc 100644
--- a/clause/order_by.go
+++ b/clause/order_by.go
@@ -1,38 +1,47 @@
 package clause
 
-type OrderBy struct {
+type OrderByColumn struct {
 	Column  Column
 	Desc    bool
 	Reorder bool
 }
 
-type OrderByClause struct {
-	Columns []OrderBy
+type OrderBy struct {
+	Columns []OrderByColumn
 }
 
 // Name where clause name
-func (orderBy OrderByClause) Name() string {
+func (orderBy OrderBy) Name() string {
 	return "ORDER BY"
 }
 
 // Build build where clause
-func (orderBy OrderByClause) Build(builder Builder) {
-	for i := len(orderBy.Columns) - 1; i >= 0; i-- {
-		builder.WriteQuoted(orderBy.Columns[i].Column)
+func (orderBy OrderBy) Build(builder Builder) {
+	for idx, column := range orderBy.Columns {
+		if idx > 0 {
+			builder.WriteByte(',')
+		}
 
-		if orderBy.Columns[i].Desc {
+		builder.WriteQuoted(column.Column)
+		if column.Desc {
 			builder.Write(" DESC")
 		}
-
-		if orderBy.Columns[i].Reorder {
-			break
-		}
 	}
 }
 
-// MergeExpression merge order by clauses
-func (orderBy OrderByClause) MergeExpression(expr Expression) {
-	if v, ok := expr.(OrderByClause); ok {
+// MergeClause merge order by clauses
+func (orderBy OrderBy) MergeClause(clause *Clause) {
+	if v, ok := clause.Expression.(OrderBy); ok {
+		for i := len(orderBy.Columns) - 1; i >= 0; i-- {
+			if orderBy.Columns[i].Reorder {
+				orderBy.Columns = orderBy.Columns[i:]
+				clause.Expression = orderBy
+				return
+			}
+		}
+
 		orderBy.Columns = append(v.Columns, orderBy.Columns...)
 	}
+
+	clause.Expression = orderBy
 }
diff --git a/clause/order_by_test.go b/clause/order_by_test.go
new file mode 100644
index 00000000..2c74a322
--- /dev/null
+++ b/clause/order_by_test.go
@@ -0,0 +1,49 @@
+package clause_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/jinzhu/gorm/clause"
+)
+
+func TestOrderBy(t *testing.T) {
+	results := []struct {
+		Clauses []clause.Interface
+		Result  string
+		Vars    []interface{}
+	}{
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.OrderBy{
+				Columns: []clause.OrderByColumn{{Column: clause.PrimaryColumn, Desc: true}},
+			}},
+			"SELECT * FROM `users` ORDER BY `users`.`id` DESC", nil,
+		},
+		{
+			[]clause.Interface{
+				clause.Select{}, clause.From{}, clause.OrderBy{
+					Columns: []clause.OrderByColumn{{Column: clause.PrimaryColumn, Desc: true}},
+				}, clause.OrderBy{
+					Columns: []clause.OrderByColumn{{Column: clause.Column{Name: "name"}}},
+				},
+			},
+			"SELECT * FROM `users` ORDER BY `users`.`id` DESC,`name`", nil,
+		},
+		{
+			[]clause.Interface{
+				clause.Select{}, clause.From{}, clause.OrderBy{
+					Columns: []clause.OrderByColumn{{Column: clause.PrimaryColumn, Desc: true}},
+				}, clause.OrderBy{
+					Columns: []clause.OrderByColumn{{Column: clause.Column{Name: "name"}, Reorder: true}},
+				},
+			},
+			"SELECT * FROM `users` ORDER BY `name`", nil,
+		},
+	}
+
+	for idx, result := range results {
+		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
+			checkBuildClauses(t, result.Clauses, result.Result, result.Vars)
+		})
+	}
+}
diff --git a/clause/query.go b/clause/query.go
deleted file mode 100644
index ce609014..00000000
--- a/clause/query.go
+++ /dev/null
@@ -1,258 +0,0 @@
-package clause
-
-import "strings"
-
-////////////////////////////////////////////////////////////////////////////////
-// Query Expressions
-////////////////////////////////////////////////////////////////////////////////
-
-func Add(exprs ...Expression) AddConditions {
-	return AddConditions(exprs)
-}
-
-func Or(exprs ...Expression) OrConditions {
-	return OrConditions(exprs)
-}
-
-type AddConditions []Expression
-
-func (cs AddConditions) Build(builder Builder) {
-	for idx, c := range cs {
-		if idx > 0 {
-			builder.Write(" AND ")
-		}
-		c.Build(builder)
-	}
-}
-
-type OrConditions []Expression
-
-func (cs OrConditions) Build(builder Builder) {
-	for idx, c := range cs {
-		if idx > 0 {
-			builder.Write(" OR ")
-		}
-		c.Build(builder)
-	}
-}
-
-type NotConditions []Expression
-
-func (cs NotConditions) Build(builder Builder) {
-	for idx, c := range cs {
-		if idx > 0 {
-			builder.Write(" AND ")
-		}
-
-		if negationBuilder, ok := c.(NegationExpressionBuilder); ok {
-			negationBuilder.NegationBuild(builder)
-		} else {
-			builder.Write(" NOT ")
-			c.Build(builder)
-		}
-	}
-}
-
-// String raw sql for where
-type String struct {
-	SQL    string
-	Values []interface{}
-}
-
-func (str String) Build(builder Builder) {
-	sql := str.SQL
-	for _, v := range str.Values {
-		sql = strings.Replace(sql, " ? ", " "+builder.AddVar(v)+" ", 1)
-	}
-	builder.Write(sql)
-}
-
-// IN Whether a value is within a set of values
-type IN struct {
-	Column interface{}
-	Values []interface{}
-}
-
-func (in IN) Build(builder Builder) {
-	builder.WriteQuoted(in.Column)
-
-	switch len(in.Values) {
-	case 0:
-		builder.Write(" IN (NULL)")
-	case 1:
-		builder.Write(" = ", builder.AddVar(in.Values...))
-	default:
-		builder.Write(" IN (", builder.AddVar(in.Values...), ")")
-	}
-}
-
-func (in IN) NegationBuild(builder Builder) {
-	switch len(in.Values) {
-	case 0:
-	case 1:
-		builder.Write(" <> ", builder.AddVar(in.Values...))
-	default:
-		builder.Write(" NOT IN (", builder.AddVar(in.Values...), ")")
-	}
-}
-
-// Eq equal to for where
-type Eq struct {
-	Column interface{}
-	Value  interface{}
-}
-
-func (eq Eq) Build(builder Builder) {
-	builder.WriteQuoted(eq.Column)
-
-	if eq.Value == nil {
-		builder.Write(" IS NULL")
-	} else {
-		builder.Write(" = ", builder.AddVar(eq.Value))
-	}
-}
-
-func (eq Eq) NegationBuild(builder Builder) {
-	Neq{eq.Column, eq.Value}.Build(builder)
-}
-
-// Neq not equal to for where
-type Neq struct {
-	Column interface{}
-	Value  interface{}
-}
-
-func (neq Neq) Build(builder Builder) {
-	builder.WriteQuoted(neq.Column)
-
-	if neq.Value == nil {
-		builder.Write(" IS NOT NULL")
-	} else {
-		builder.Write(" <> ", builder.AddVar(neq.Value))
-	}
-}
-
-func (neq Neq) NegationBuild(builder Builder) {
-	Eq{neq.Column, neq.Value}.Build(builder)
-}
-
-// Gt greater than for where
-type Gt struct {
-	Column interface{}
-	Value  interface{}
-}
-
-func (gt Gt) Build(builder Builder) {
-	builder.WriteQuoted(gt.Column)
-	builder.Write(" > ", builder.AddVar(gt.Value))
-}
-
-func (gt Gt) NegationBuild(builder Builder) {
-	Lte{gt.Column, gt.Value}.Build(builder)
-}
-
-// Gte greater than or equal to for where
-type Gte struct {
-	Column interface{}
-	Value  interface{}
-}
-
-func (gte Gte) Build(builder Builder) {
-	builder.WriteQuoted(gte.Column)
-	builder.Write(" >= ", builder.AddVar(gte.Value))
-}
-
-func (gte Gte) NegationBuild(builder Builder) {
-	Lt{gte.Column, gte.Value}.Build(builder)
-}
-
-// Lt less than for where
-type Lt struct {
-	Column interface{}
-	Value  interface{}
-}
-
-func (lt Lt) Build(builder Builder) {
-	builder.WriteQuoted(lt.Column)
-	builder.Write(" < ", builder.AddVar(lt.Value))
-}
-
-func (lt Lt) NegationBuild(builder Builder) {
-	Gte{lt.Column, lt.Value}.Build(builder)
-}
-
-// Lte less than or equal to for where
-type Lte struct {
-	Column interface{}
-	Value  interface{}
-}
-
-func (lte Lte) Build(builder Builder) {
-	builder.WriteQuoted(lte.Column)
-	builder.Write(" <= ", builder.AddVar(lte.Value))
-}
-
-func (lte Lte) NegationBuild(builder Builder) {
-	Gt{lte.Column, lte.Value}.Build(builder)
-}
-
-// Like whether string matches regular expression
-type Like struct {
-	Column interface{}
-	Value  interface{}
-}
-
-func (like Like) Build(builder Builder) {
-	builder.WriteQuoted(like.Column)
-	builder.Write(" LIKE ", builder.AddVar(like.Value))
-}
-
-func (like Like) NegationBuild(builder Builder) {
-	builder.WriteQuoted(like.Column)
-	builder.Write(" NOT LIKE ", builder.AddVar(like.Value))
-}
-
-// Map
-type Map map[interface{}]interface{}
-
-func (m Map) Build(builder Builder) {
-	// TODO
-}
-
-func (m Map) NegationBuild(builder Builder) {
-	// TODO
-}
-
-// Attrs
-type Attrs struct {
-	Value  interface{}
-	Select []string
-	Omit   []string
-}
-
-func (attrs Attrs) Build(builder Builder) {
-	// TODO
-	// builder.WriteQuoted(like.Column)
-	// builder.Write(" LIKE ", builder.AddVar(like.Value))
-}
-
-func (attrs Attrs) NegationBuild(builder Builder) {
-	// TODO
-}
-
-// ID
-type ID struct {
-	Value []interface{}
-}
-
-func (id ID) Build(builder Builder) {
-	if len(id.Value) == 1 {
-	}
-	// TODO
-	// builder.WriteQuoted(like.Column)
-	// builder.Write(" LIKE ", builder.AddVar(like.Value))
-}
-
-func (id ID) NegationBuild(builder Builder) {
-	// TODO
-}
diff --git a/clause/returning.go b/clause/returning.go
new file mode 100644
index 00000000..04bc96da
--- /dev/null
+++ b/clause/returning.go
@@ -0,0 +1,30 @@
+package clause
+
+type Returning struct {
+	Columns []Column
+}
+
+// Name where clause name
+func (returning Returning) Name() string {
+	return "RETURNING"
+}
+
+// Build build where clause
+func (returning Returning) Build(builder Builder) {
+	for idx, column := range returning.Columns {
+		if idx > 0 {
+			builder.WriteByte(',')
+		}
+
+		builder.WriteQuoted(column)
+	}
+}
+
+// MergeClause merge order by clauses
+func (returning Returning) MergeClause(clause *Clause) {
+	if v, ok := clause.Expression.(Returning); ok {
+		returning.Columns = append(v.Columns, returning.Columns...)
+	}
+
+	clause.Expression = returning
+}
diff --git a/clause/returning_test.go b/clause/returning_test.go
new file mode 100644
index 00000000..e9fed1cb
--- /dev/null
+++ b/clause/returning_test.go
@@ -0,0 +1,36 @@
+package clause_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/jinzhu/gorm/clause"
+)
+
+func TestReturning(t *testing.T) {
+	results := []struct {
+		Clauses []clause.Interface
+		Result  string
+		Vars    []interface{}
+	}{
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.Returning{
+				[]clause.Column{clause.PrimaryColumn},
+			}},
+			"SELECT * FROM `users` RETURNING `users`.`id`", nil,
+		}, {
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.Returning{
+				[]clause.Column{clause.PrimaryColumn},
+			}, clause.Returning{
+				[]clause.Column{{Name: "name"}, {Name: "age"}},
+			}},
+			"SELECT * FROM `users` RETURNING `users`.`id`,`name`,`age`", nil,
+		},
+	}
+
+	for idx, result := range results {
+		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
+			checkBuildClauses(t, result.Clauses, result.Result, result.Vars)
+		})
+	}
+}
diff --git a/clause/select.go b/clause/select.go
index 7f0e4438..4bb1af8d 100644
--- a/clause/select.go
+++ b/clause/select.go
@@ -1,32 +1,18 @@
 package clause
 
-// SelectInterface select clause interface
-type SelectInterface interface {
-	Selects() []Column
-	Omits() []Column
-}
-
 // Select select attrs when querying, updating, creating
 type Select struct {
-	SelectColumns []Column
-	OmitColumns   []Column
+	Columns []Column
+	Omits   []Column
 }
 
 func (s Select) Name() string {
 	return "SELECT"
 }
 
-func (s Select) Selects() []Column {
-	return s.SelectColumns
-}
-
-func (s Select) Omits() []Column {
-	return s.OmitColumns
-}
-
 func (s Select) Build(builder Builder) {
-	if len(s.SelectColumns) > 0 {
-		for idx, column := range s.SelectColumns {
+	if len(s.Columns) > 0 {
+		for idx, column := range s.Columns {
 			if idx > 0 {
 				builder.WriteByte(',')
 			}
@@ -37,13 +23,10 @@ func (s Select) Build(builder Builder) {
 	}
 }
 
-func (s Select) MergeExpression(expr Expression) {
-	if v, ok := expr.(SelectInterface); ok {
-		if len(s.SelectColumns) == 0 {
-			s.SelectColumns = v.Selects()
-		}
-		if len(s.OmitColumns) == 0 {
-			s.OmitColumns = v.Omits()
-		}
+func (s Select) MergeClause(clause *Clause) {
+	if v, ok := clause.Expression.(Select); ok {
+		s.Columns = append(v.Columns, s.Columns...)
+		s.Omits = append(v.Omits, s.Omits...)
 	}
+	clause.Expression = s
 }
diff --git a/clause/select_test.go b/clause/select_test.go
new file mode 100644
index 00000000..8255e51b
--- /dev/null
+++ b/clause/select_test.go
@@ -0,0 +1,41 @@
+package clause_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/jinzhu/gorm/clause"
+)
+
+func TestSelect(t *testing.T) {
+	results := []struct {
+		Clauses []clause.Interface
+		Result  string
+		Vars    []interface{}
+	}{
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}},
+			"SELECT * FROM `users`", nil,
+		},
+		{
+			[]clause.Interface{clause.Select{
+				Columns: []clause.Column{clause.PrimaryColumn},
+			}, clause.From{}},
+			"SELECT `users`.`id` FROM `users`", nil,
+		},
+		{
+			[]clause.Interface{clause.Select{
+				Columns: []clause.Column{clause.PrimaryColumn},
+			}, clause.Select{
+				Columns: []clause.Column{{Name: "name"}},
+			}, clause.From{}},
+			"SELECT `users`.`id`,`name` FROM `users`", nil,
+		},
+	}
+
+	for idx, result := range results {
+		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
+			checkBuildClauses(t, result.Clauses, result.Result, result.Vars)
+		})
+	}
+}
diff --git a/clause/set.go b/clause/set.go
new file mode 100644
index 00000000..3b7e972d
--- /dev/null
+++ b/clause/set.go
@@ -0,0 +1,37 @@
+package clause
+
+type Set []Assignment
+
+type Assignment struct {
+	Column Column
+	Value  interface{}
+}
+
+func (set Set) Name() string {
+	return "SET"
+}
+
+func (set Set) Build(builder Builder) {
+	if len(set) > 0 {
+		for idx, assignment := range set {
+			if idx > 0 {
+				builder.WriteByte(',')
+			}
+			builder.WriteQuoted(assignment.Column)
+			builder.WriteByte('=')
+			builder.Write(builder.AddVar(assignment.Value))
+		}
+	} else {
+		builder.WriteQuoted(PrimaryColumn)
+		builder.WriteByte('=')
+		builder.WriteQuoted(PrimaryColumn)
+	}
+}
+
+// MergeClause merge assignments clauses
+func (set Set) MergeClause(clause *Clause) {
+	if v, ok := clause.Expression.(Set); ok {
+		set = append(v, set...)
+	}
+	clause.Expression = set
+}
diff --git a/clause/set_test.go b/clause/set_test.go
new file mode 100644
index 00000000..85754737
--- /dev/null
+++ b/clause/set_test.go
@@ -0,0 +1,38 @@
+package clause_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/jinzhu/gorm/clause"
+)
+
+func TestSet(t *testing.T) {
+	results := []struct {
+		Clauses []clause.Interface
+		Result  string
+		Vars    []interface{}
+	}{
+		{
+			[]clause.Interface{
+				clause.Update{},
+				clause.Set([]clause.Assignment{{clause.PrimaryColumn, 1}}),
+			},
+			"UPDATE `users` SET `users`.`id`=?", []interface{}{1},
+		},
+		{
+			[]clause.Interface{
+				clause.Update{},
+				clause.Set([]clause.Assignment{{clause.PrimaryColumn, 1}}),
+				clause.Set([]clause.Assignment{{clause.Column{Name: "name"}, "jinzhu"}}),
+			},
+			"UPDATE `users` SET `users`.`id`=?,`name`=?", []interface{}{1, "jinzhu"},
+		},
+	}
+
+	for idx, result := range results {
+		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
+			checkBuildClauses(t, result.Clauses, result.Result, result.Vars)
+		})
+	}
+}
diff --git a/clause/update.go b/clause/update.go
new file mode 100644
index 00000000..c375b373
--- /dev/null
+++ b/clause/update.go
@@ -0,0 +1,38 @@
+package clause
+
+type Update struct {
+	Modifier string
+	Table    Table
+}
+
+// Name update clause name
+func (update Update) Name() string {
+	return "UPDATE"
+}
+
+// Build build update clause
+func (update Update) Build(builder Builder) {
+	if update.Modifier != "" {
+		builder.Write(update.Modifier)
+		builder.WriteByte(' ')
+	}
+
+	if update.Table.Name == "" {
+		builder.WriteQuoted(currentTable)
+	} else {
+		builder.WriteQuoted(update.Table)
+	}
+}
+
+// MergeClause merge update clause
+func (update Update) MergeClause(clause *Clause) {
+	if v, ok := clause.Expression.(Update); ok {
+		if update.Modifier == "" {
+			update.Modifier = v.Modifier
+		}
+		if update.Table.Name == "" {
+			update.Table = v.Table
+		}
+	}
+	clause.Expression = update
+}
diff --git a/clause/update_test.go b/clause/update_test.go
new file mode 100644
index 00000000..adc48f03
--- /dev/null
+++ b/clause/update_test.go
@@ -0,0 +1,35 @@
+package clause_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/jinzhu/gorm/clause"
+)
+
+func TestUpdate(t *testing.T) {
+	results := []struct {
+		Clauses []clause.Interface
+		Result  string
+		Vars    []interface{}
+	}{
+		{
+			[]clause.Interface{clause.Update{}},
+			"UPDATE `users`", nil,
+		},
+		{
+			[]clause.Interface{clause.Update{Modifier: "LOW_PRIORITY"}},
+			"UPDATE LOW_PRIORITY `users`", nil,
+		},
+		{
+			[]clause.Interface{clause.Update{Table: clause.Table{Name: "products"}, Modifier: "LOW_PRIORITY"}},
+			"UPDATE LOW_PRIORITY `products`", nil,
+		},
+	}
+
+	for idx, result := range results {
+		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
+			checkBuildClauses(t, result.Clauses, result.Result, result.Vars)
+		})
+	}
+}
diff --git a/clause/value.go b/clause/values.go
similarity index 76%
rename from clause/value.go
rename to clause/values.go
index 4de0d91e..594b92e2 100644
--- a/clause/value.go
+++ b/clause/values.go
@@ -25,11 +25,11 @@ func (values Values) Build(builder Builder) {
 		builder.Write(" VALUES ")
 
 		for idx, value := range values.Values {
-			builder.WriteByte('(')
 			if idx > 0 {
 				builder.WriteByte(',')
 			}
 
+			builder.WriteByte('(')
 			builder.Write(builder.AddVar(value...))
 			builder.WriteByte(')')
 		}
@@ -37,3 +37,11 @@ func (values Values) Build(builder Builder) {
 		builder.Write("DEFAULT VALUES")
 	}
 }
+
+// MergeClause merge values clauses
+func (values Values) MergeClause(clause *Clause) {
+	if v, ok := clause.Expression.(Values); ok {
+		values.Values = append(v.Values, values.Values...)
+	}
+	clause.Expression = values
+}
diff --git a/clause/values_test.go b/clause/values_test.go
new file mode 100644
index 00000000..ced4f1e6
--- /dev/null
+++ b/clause/values_test.go
@@ -0,0 +1,33 @@
+package clause_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/jinzhu/gorm/clause"
+)
+
+func TestValues(t *testing.T) {
+	results := []struct {
+		Clauses []clause.Interface
+		Result  string
+		Vars    []interface{}
+	}{
+		{
+			[]clause.Interface{
+				clause.Insert{},
+				clause.Values{
+					Columns: []clause.Column{{Name: "name"}, {Name: "age"}},
+					Values:  [][]interface{}{{"jinzhu", 18}, {"josh", 1}},
+				},
+			},
+			"INSERT INTO `users` (`name`,`age`) VALUES (?,?),(?,?)", []interface{}{"jinzhu", 18, "josh", 1},
+		},
+	}
+
+	for idx, result := range results {
+		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
+			checkBuildClauses(t, result.Clauses, result.Result, result.Vars)
+		})
+	}
+}
diff --git a/clause/where.go b/clause/where.go
index de82662c..d0f57ed1 100644
--- a/clause/where.go
+++ b/clause/where.go
@@ -2,9 +2,7 @@ package clause
 
 // Where where clause
 type Where struct {
-	AndConditions AddConditions
-	OrConditions  []OrConditions
-	builders      []Expression
+	Exprs []Expression
 }
 
 // Name where clause name
@@ -14,64 +12,122 @@ func (where Where) Name() string {
 
 // Build build where clause
 func (where Where) Build(builder Builder) {
-	var withConditions bool
-
-	if len(where.AndConditions) > 0 {
-		withConditions = true
-		where.AndConditions.Build(builder)
-	}
-
-	if len(where.builders) > 0 {
-		for _, b := range where.builders {
-			if withConditions {
-				builder.Write(" AND ")
+	// Switch position if the first query expression is a single Or condition
+	for idx, expr := range where.Exprs {
+		if v, ok := expr.(OrConditions); (!ok && expr != nil) || len(v.Exprs) > 1 {
+			if idx != 0 {
+				where.Exprs[0], where.Exprs[idx] = where.Exprs[idx], where.Exprs[0]
 			}
-			withConditions = true
-			b.Build(builder)
+			break
 		}
 	}
 
-	var singleOrConditions []OrConditions
-	for _, or := range where.OrConditions {
-		if len(or) == 1 {
-			if withConditions {
-				builder.Write(" OR ")
-				or.Build(builder)
-			} else {
-				singleOrConditions = append(singleOrConditions, or)
+	for idx, expr := range where.Exprs {
+		if expr != nil {
+			if idx > 0 {
+				if v, ok := expr.(OrConditions); ok && len(v.Exprs) == 1 {
+					builder.Write(" OR ")
+				} else {
+					builder.Write(" AND ")
+				}
 			}
-		} else {
-			withConditions = true
-			builder.Write(" AND (")
-			or.Build(builder)
-			builder.WriteByte(')')
-		}
-	}
 
-	for _, or := range singleOrConditions {
-		if withConditions {
-			builder.Write(" AND ")
-			or.Build(builder)
-		} else {
-			withConditions = true
-			or.Build(builder)
+			expr.Build(builder)
 		}
 	}
 
-	if !withConditions {
-		builder.Write(" FALSE")
-	}
-
 	return
 }
 
-// MergeExpression merge where clauses
-func (where Where) MergeExpression(expr Expression) {
-	if w, ok := expr.(Where); ok {
-		where.AndConditions = append(where.AndConditions, w.AndConditions...)
-		where.OrConditions = append(where.OrConditions, w.OrConditions...)
-		where.builders = append(where.builders, w.builders...)
-	} else {
-		where.builders = append(where.builders, expr)
+// MergeClause merge where clauses
+func (where Where) MergeClause(clause *Clause) {
+	if w, ok := clause.Expression.(Where); ok {
+		where.Exprs = append(w.Exprs, where.Exprs...)
+	}
+
+	clause.Expression = where
+}
+
+func And(exprs ...Expression) Expression {
+	if len(exprs) == 0 {
+		return nil
+	}
+	return AndConditions{Exprs: exprs}
+}
+
+type AndConditions struct {
+	Exprs []Expression
+}
+
+func (and AndConditions) Build(builder Builder) {
+	if len(and.Exprs) > 1 {
+		builder.Write("(")
+	}
+	for idx, c := range and.Exprs {
+		if idx > 0 {
+			builder.Write(" AND ")
+		}
+		c.Build(builder)
+	}
+	if len(and.Exprs) > 1 {
+		builder.Write(")")
+	}
+}
+
+func Or(exprs ...Expression) Expression {
+	if len(exprs) == 0 {
+		return nil
+	}
+	return OrConditions{Exprs: exprs}
+}
+
+type OrConditions struct {
+	Exprs []Expression
+}
+
+func (or OrConditions) Build(builder Builder) {
+	if len(or.Exprs) > 1 {
+		builder.Write("(")
+	}
+	for idx, c := range or.Exprs {
+		if idx > 0 {
+			builder.Write(" OR ")
+		}
+		c.Build(builder)
+	}
+	if len(or.Exprs) > 1 {
+		builder.Write(")")
+	}
+}
+
+func Not(exprs ...Expression) Expression {
+	if len(exprs) == 0 {
+		return nil
+	}
+	return NotConditions{Exprs: exprs}
+}
+
+type NotConditions struct {
+	Exprs []Expression
+}
+
+func (not NotConditions) Build(builder Builder) {
+	if len(not.Exprs) > 1 {
+		builder.Write("(")
+	}
+	for idx, c := range not.Exprs {
+		if idx > 0 {
+			builder.Write(" AND ")
+		}
+
+		if negationBuilder, ok := c.(NegationExpressionBuilder); ok {
+			negationBuilder.NegationBuild(builder)
+		} else {
+			builder.Write(" NOT ")
+			c.Build(builder)
+		}
+	}
+	if len(not.Exprs) > 1 {
+		builder.Write(")")
 	}
 }
diff --git a/clause/where_test.go b/clause/where_test.go
new file mode 100644
index 00000000..450a0c89
--- /dev/null
+++ b/clause/where_test.go
@@ -0,0 +1,63 @@
+package clause_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/jinzhu/gorm/clause"
+)
+
+func TestWhere(t *testing.T) {
+	results := []struct {
+		Clauses []clause.Interface
+		Result  string
+		Vars    []interface{}
+	}{
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.Where{
+				Exprs: []clause.Expression{clause.Eq{Column: clause.PrimaryColumn, Value: "1"}, clause.Gt{Column: "age", Value: 18}, clause.Or(clause.Neq{Column: "name", Value: "jinzhu"})},
+			}},
+			"SELECT * FROM `users` WHERE `users`.`id` = ? AND `age` > ? OR `name` <> ?", []interface{}{"1", 18, "jinzhu"},
+		},
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.Where{
+				Exprs: []clause.Expression{clause.Or(clause.Neq{Column: "name", Value: "jinzhu"}), clause.Eq{Column: clause.PrimaryColumn, Value: "1"}, clause.Gt{Column: "age", Value: 18}},
+			}},
+			"SELECT * FROM `users` WHERE `users`.`id` = ? OR `name` <> ? AND `age` > ?", []interface{}{"1", "jinzhu", 18},
+		},
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.Where{
+				Exprs: []clause.Expression{clause.Or(), clause.Or(clause.Neq{Column: "name", Value: "jinzhu"}), clause.Eq{Column: clause.PrimaryColumn, Value: "1"}, clause.Gt{Column: "age", Value: 18}},
+			}},
+			"SELECT * FROM `users` WHERE `users`.`id` = ? OR `name` <> ? AND `age` > ?", []interface{}{"1", "jinzhu", 18},
+		},
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.Where{
+				Exprs: []clause.Expression{clause.Or(clause.Eq{Column: clause.PrimaryColumn, Value: "1"}), clause.Or(clause.Neq{Column: "name", Value: "jinzhu"})},
+			}},
+			"SELECT * FROM `users` WHERE `users`.`id` = ? OR `name` <> ?", []interface{}{"1", "jinzhu"},
+		},
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.Where{
+				Exprs: []clause.Expression{clause.Eq{Column: clause.PrimaryColumn, Value: "1"}, clause.Gt{Column: "age", Value: 18}, clause.Or(clause.Neq{Column: "name", Value: "jinzhu"})},
+			}, clause.Where{
+				Exprs: []clause.Expression{clause.Or(clause.Gt{Column: "score", Value: 100}, clause.Like{Column: "name", Value: "%linus%"})},
+			}},
+			"SELECT * FROM `users` WHERE `users`.`id` = ? AND `age` > ? OR `name` <> ? AND (`score` > ? OR `name` LIKE ?)", []interface{}{"1", 18, "jinzhu", 100, "%linus%"},
+		},
+		{
+			[]clause.Interface{clause.Select{}, clause.From{}, clause.Where{
+				Exprs: []clause.Expression{clause.Not(clause.Eq{Column: clause.PrimaryColumn, Value: "1"}, clause.Gt{Column: "age", Value: 18}), clause.Or(clause.Neq{Column: "name", Value: "jinzhu"})},
+			}, clause.Where{
+				Exprs: []clause.Expression{clause.Or(clause.Not(clause.Gt{Column: "score", Value: 100}), clause.Like{Column: "name", Value: "%linus%"})},
+			}},
+			"SELECT * FROM `users` WHERE (`users`.`id` <> ? AND `age` <= ?) OR `name` <> ? AND (`score` <= ? OR `name` LIKE ?)", []interface{}{"1", 18, "jinzhu", 100, "%linus%"},
+		},
+	}
+
+	for idx, result := range results {
+		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
+			checkBuildClauses(t, result.Clauses, result.Result, result.Vars)
+		})
+	}
+}
diff --git a/finisher_api.go b/finisher_api.go
index 06809651..5389ed6a 100644
--- a/finisher_api.go
+++ b/finisher_api.go
@@ -22,7 +22,7 @@ func (db *DB) Save(value interface{}) (tx *DB) {
 
 // First find first record that match given conditions, order by primary key
 func (db *DB) First(out interface{}, where ...interface{}) (tx *DB) {
-	tx = db.getInstance().Limit(1).Order(clause.OrderBy{
+	tx = db.getInstance().Limit(1).Order(clause.OrderByColumn{
 		Column: clause.Column{Table: clause.CurrentTable, Name: clause.PrimaryKey},
 		Desc:   true,
 	})
diff --git a/statement.go b/statement.go
index bc07b6e4..5dd49623 100644
--- a/statement.go
+++ b/statement.go
@@ -5,7 +5,6 @@ import (
 	"database/sql"
 	"database/sql/driver"
 	"fmt"
-	"log"
 	"strconv"
 	"strings"
 	"sync"
@@ -26,7 +25,7 @@ func (instance *Instance) ToSQL(clauses ...string) (string, []interface{}) {
 	if len(clauses) > 0 {
 		instance.Statement.Build(clauses...)
 	}
-	return instance.Statement.SQL.String(), instance.Statement.Vars
+	return strings.TrimSpace(instance.Statement.SQL.String()), instance.Statement.Vars
 }
 
 // AddError add error to instance
@@ -85,10 +84,10 @@ func (stmt Statement) Quote(field interface{}) string {
 
 	switch v := field.(type) {
 	case clause.Table:
-		if v.Table == clause.CurrentTable {
+		if v.Name == clause.CurrentTable {
 			str.WriteString(stmt.Table)
 		} else {
-			str.WriteString(v.Table)
+			str.WriteString(v.Name)
 		}
 
 		if v.Alias != "" {
@@ -126,7 +125,7 @@ func (stmt Statement) Quote(field interface{}) string {
 			str.WriteByte(stmt.DB.quoteChars[1])
 		}
 	default:
-		fmt.Sprint(field)
+		str.WriteString(fmt.Sprint(field))
 	}
 
 	str.WriteByte(stmt.DB.quoteChars[1])
@@ -141,19 +140,28 @@ func (stmt *Statement) AddVar(vars ...interface{}) string {
 			placeholders.WriteByte(',')
 		}
 
-		if namedArg, ok := v.(sql.NamedArg); ok && len(namedArg.Name) > 0 {
-			stmt.NamedVars = append(stmt.NamedVars, namedArg)
-			placeholders.WriteByte('@')
-			placeholders.WriteString(namedArg.Name)
-		} else if arrs, ok := v.([]interface{}); ok {
+		switch v := v.(type) {
+		case sql.NamedArg:
+			if len(v.Name) > 0 {
+				stmt.NamedVars = append(stmt.NamedVars, v)
+				placeholders.WriteByte('@')
+				placeholders.WriteString(v.Name)
+			} else {
+				stmt.Vars = append(stmt.Vars, v.Value)
+				placeholders.WriteString(stmt.DB.Dialector.BindVar(stmt, v.Value))
+			}
+		case clause.Column:
+			placeholders.WriteString(stmt.Quote(v))
+		case []interface{}:
 			placeholders.WriteByte('(')
-			if len(arrs) > 0 {
-				placeholders.WriteString(stmt.AddVar(arrs...))
+			if len(v) > 0 {
+				placeholders.WriteString(stmt.AddVar(v...))
 			} else {
 				placeholders.WriteString("NULL")
 			}
 			placeholders.WriteByte(')')
-		} else {
+		default:
+			stmt.Vars = append(stmt.Vars, v)
 			placeholders.WriteString(stmt.DB.Dialector.BindVar(stmt, v))
 		}
 	}
@@ -166,42 +174,18 @@ func (stmt *Statement) AddClause(v clause.Interface) {
 		optimizer.OptimizeStatement(stmt)
 	}
 
-	c, _ := stmt.Clauses[v.Name()]
-	if namer, ok := v.(clause.OverrideNameInterface); ok {
-		c.Name = namer.OverrideName()
-	} else {
+	c, ok := stmt.Clauses[v.Name()]
+	if !ok {
 		c.Name = v.Name()
 	}
-
-	if c.Expression != nil {
-		v.MergeExpression(c.Expression)
-	}
-
-	c.Expression = v
+	v.MergeClause(&c)
 	stmt.Clauses[v.Name()] = c
 }
 
 // AddClauseIfNotExists add clause if not exists
 func (stmt *Statement) AddClauseIfNotExists(v clause.Interface) {
-	if optimizer, ok := v.(StatementOptimizer); ok {
-		optimizer.OptimizeStatement(stmt)
-	}
-
-	log.Println(v.Name())
-	if c, ok := stmt.Clauses[v.Name()]; !ok {
-		if namer, ok := v.(clause.OverrideNameInterface); ok {
-			c.Name = namer.OverrideName()
-		} else {
-			c.Name = v.Name()
-		}
-
-		if c.Expression != nil {
-			v.MergeExpression(c.Expression)
-		}
-
-		c.Expression = v
-		stmt.Clauses[v.Name()] = c
-		log.Println(stmt.Clauses[v.Name()])
+	if _, ok := stmt.Clauses[v.Name()]; !ok {
+		stmt.AddClause(v)
 	}
 }
 
@@ -211,7 +195,7 @@ func (stmt Statement) BuildCondtion(query interface{}, args ...interface{}) (con
 		if i, err := strconv.Atoi(sql); err != nil {
 			query = i
 		} else if len(args) == 0 || (len(args) > 0 && strings.Contains(sql, "?")) || strings.Contains(sql, "@") {
-			return []clause.Expression{clause.String{SQL: sql, Values: args}}
+			return []clause.Expression{clause.Expr{SQL: sql, Vars: args}}
 		}
 	}
 
@@ -255,7 +239,7 @@ func (stmt Statement) BuildCondtion(query interface{}, args ...interface{}) (con
 	}
 
 	if len(conditions) == 0 {
-		conditions = append(conditions, clause.ID{Value: args})
+		conditions = append(conditions, clause.IN{Column: clause.PrimaryColumn, Values: args})
 	}
 
 	return conditions