// From from clause
type From struct {
	Tables []Table
	Joins  []Join
}

// Name from clause name
func (from From) Name() string {
	return "FROM"
}

// Build build from clause
func (from From) Build(builder Builder) {
	if len(from.Tables) > 0 {
		for idx, table := range from.Tables {
			if idx > 0 {
				builder.WriteByte(',')
			}

			builder.WriteQuoted(table)
		}
	} else {

)

// Namer namer interface
type Namer interface {
	TableName(table string) string
	SchemaName(table string) string
	ColumnName(table, column string) string
	JoinTableName(joinTable string) string
	RelationshipFKName(Relationship) string
	CheckerName(table, column string) string
	IndexName(table, column string) string
	UniqueName(table, column string) string
}

// Replacer replacer interface like strings.Replacer

		currentDatabase := m.DB.Migrator().CurrentDatabase()
		return m.DB.Raw("SELECT count(*) FROM information_schema.tables WHERE table_schema = ? AND table_name = ? AND table_type = ?", currentDatabase, stmt.Table, "BASE TABLE").Row().Scan(&count)
	})

	return count > 0
}

// RenameTable rename table from oldName to newName
func (m Migrator) RenameTable(oldName, newName interface{}) error {
	var oldTable, newTable interface{}

			if results[1] != "" {
				tx.Statement.Table = results[1]
			} else {
				tx.Statement.Table = results[2]
			}
		}
	} else if tables := strings.Split(name, "."); len(tables) == 2 {
		tx.Statement.TableExpr = &clause.Expr{SQL: tx.Statement.Quote(name)}
		tx.Statement.Table = tables[1]
	} else if name != "" {
		tx.Statement.TableExpr = &clause.Expr{SQL: tx.Statement.Quote(name)}

										Column: clause.Column{Table: parentTableName, Name: ref.PrimaryKey.DBName},
										Value:  clause.Column{Table: tableAliasName, Name: ref.ForeignKey.DBName},
									}
								} else {
									if ref.PrimaryValue == "" {
										exprs[idx] = clause.Eq{
											Column: clause.Column{Table: parentTableName, Name: ref.ForeignKey.DBName},
											Value:  clause.Column{Table: tableAliasName, Name: ref.PrimaryKey.DBName},

)

type Locking struct {
	Strength string
	Table    Table
	Options  string
}

// Name where clause name
func (locking Locking) Name() string {
	return "FOR"
}

// Build build where clause
func (locking Locking) Build(builder Builder) {
	builder.WriteString(locking.Strength)
	if locking.Table.Name != "" {
		builder.WriteString(" OF ")
		builder.WriteQuoted(locking.Table)
	}

	if locking.Options != "" {

				if r.JoinTable.Name != relation.JoinTable.Name {
					t.Errorf("schema %v relation's join table name expects %v, but got %v", s, relation.JoinTable.Name, r.JoinTable.Name)
				}

				if r.JoinTable.Table != relation.JoinTable.Table {
					t.Errorf("schema %v relation's join table tablename expects %v, but got %v", s, relation.JoinTable.Table, r.JoinTable.Table)
				}

				for i := range relation.JoinTable.Fields {

	"gorm.io/gorm/utils/tests"
)

func BenchmarkSelect(b *testing.B) {
	user, _ := schema.Parse(&tests.User{}, &sync.Map{}, db.NamingStrategy)

	for i := 0; i < b.N; i++ {
		stmt := gorm.Statement{DB: db, Table: user.Table, Schema: user, Clauses: map[string]clause.Clause{}}

type Index struct {
	TableName       string
	NameValue       string
	ColumnList      []string
	PrimaryKeyValue sql.NullBool
	UniqueValue     sql.NullBool
	OptionValue     string
}

// Table return the table name of the index.
func (idx Index) Table() string {
	return idx.TableName
}

// Name return the name of the index.
func (idx Index) Name() string {
	return idx.NameValue
}

// Columns return the columns of the index

		t.Errorf("Should found two users's name in 1, 3, but got %v", len(users3))
	}

	db := DB.Scopes(func(tx *gorm.DB) *gorm.DB {
		return tx.Table("custom_table")
	}).Session(&gorm.Session{})

	db.AutoMigrate(&User{})
	if db.Find(&User{}).Statement.Table != "custom_table" {
		t.Errorf("failed to call Scopes")
	}

	result := DB.Scopes(NameIn1And2, func(tx *gorm.DB) *gorm.DB {
		return tx.Session(&gorm.Session{})