if chk := field.TagSettings["CHECK"]; chk != "" {
			names := strings.Split(chk, ",")
			if len(names) > 1 && regEnLetterAndMidline.MatchString(names[0]) {
				checks[names[0]] = CheckConstraint{Name: names[0], Constraint: strings.Join(names[1:], ","), Field: field}
			} else {
				if names[0] == "" {
					chk = strings.Join(names[1:], ",")
				}
				name := schema.namer.CheckerName(schema.Table, field.DBName)

	})

	for _, c := range cs {
		// show warning message the callback name already exists
		if idx := getRIndex(names, c.name); idx > -1 && !c.replace && !c.remove && !cs[idx].remove {
			c.processor.db.Logger.Warn(context.Background(), "duplicated callback `%s` from %s\n", c.name, utils.FileWithLineNum())
		}
		names = append(names, c.name)
	}

	sortCallback = func(c *callback) error {
		if c.before != "" { // if defined before callback

						}
					} else if names := utils.SplitNestedRelationName(column); len(names) > 1 { // has nested relation
						if rel, ok := sch.Relationships.Relations[names[0]]; ok {
							subNameCount := len(names)
							// nested relation fields
							relFields := make([]*schema.Field, 0, subNameCount-1)
							relFields = append(relFields, rel.Field)
							for _, name := range names[1 : subNameCount-1] {

	}
	users[0].Age = 20

	if err := DB.Create(&users).Error; err != nil {
		t.Fatalf("errors happened when create users: %v", err)
	}

	var names []string
	DB.Table("users").Where("name like ?", "distinct%").Order("name").Pluck("name", &names)
	AssertEqual(t, names, []string{"distinct", "distinct", "distinct", "distinct-2", "distinct-3"})

	var names1 []string

}

func NameIn2And3(d *gorm.DB) *gorm.DB {
	return d.Where("name in (?)", []string{"ScopeUser2", "ScopeUser3"})
}

func NameIn(names []string) func(d *gorm.DB) *gorm.DB {
	return func(d *gorm.DB) *gorm.DB {
		return d.Where("name in (?)", names)
	}
}

func TestScopes(t *testing.T) {
	users := []*User{
		GetUser("ScopeUser1", Config{}),
		GetUser("ScopeUser2", Config{}),

		tx.Statement.Table = name
	} else {
		tx.Statement.TableExpr = nil
		tx.Statement.Table = ""
	}
	return
}

// Distinct specify distinct fields that you want querying
//
//	// Select distinct names of users
//	db.Distinct("name").Find(&results)
//	// Select distinct name/age pairs from users
//	db.Distinct("name", "age").Find(&results)
func (db *DB) Distinct(args ...interface{}) (tx *DB) {
	tx = db.getInstance()

package tests

import (
	"database/sql/driver"
	"fmt"
	"go/ast"
	"reflect"
	"testing"
	"time"

	"gorm.io/gorm/utils"
)

func AssertObjEqual(t *testing.T, r, e interface{}, names ...string) {
	for _, name := range names {
		rv := reflect.Indirect(reflect.ValueOf(r))
		ev := reflect.Indirect(reflect.ValueOf(e))
		if rv.IsValid() != ev.IsValid() {
			t.Errorf("%v: expect: %+v, got %+v", utils.FileWithLineNum(), r, e)
			return

// string is returned, then the driver type name is not supported.
// Consult your driver documentation for a list of driver data types. Length specifiers
// are not included.
// Common type names include "VARCHAR", "TEXT", "NVARCHAR", "DECIMAL", "BOOL",
// "INT", and "BIGINT".
func (ct ColumnType) DatabaseTypeName() string {
	if ct.DataTypeValue.Valid {
		return ct.DataTypeValue.String
	}

		t.Fatalf("Found deleted column")
	}
}

func TestMigrateConstraint(t *testing.T) {
	names := []string{"Account", "fk_users_account", "Pets", "fk_users_pets", "Company", "fk_users_company", "Team", "fk_users_team", "Languages", "fk_users_languages"}

	for _, name := range names {
		if !DB.Migrator().HasConstraint(&User{}, name) {
			DB.Migrator().CreateConstraint(&User{}, name)
		}

	settings := map[string]string{}
	names := strings.Split(str, sep)

	for i := 0; i < len(names); i++ {
		j := i
		if len(names[j]) > 0 {
			for {
				if names[j][len(names[j])-1] == '\\' {
					i++
					names[j] = names[j][0:len(names[j])-1] + sep + names[i]
					names[i] = ""
				} else {
					break
				}
			}
		}

		values := strings.Split(names[j], ":")