diff --git a/callbacks/query.go b/callbacks/query.go
index 11753472..a10f1a62 100644
--- a/callbacks/query.go
+++ b/callbacks/query.go
@@ -121,7 +121,7 @@ func BuildQuerySQL(db *gorm.DB) {
 						clauseSelect.Columns = append(clauseSelect.Columns, clause.Column{
 							Table: tableAliasName,
 							Name:  s,
-							Alias: tableAliasName + "__" + s,
+							Alias: tableAliasName + gorm.DoubleUnderscore + s,
 						})
 					}
 
diff --git a/scan.go b/scan.go
index acd637a4..a8bb0c15 100644
--- a/scan.go
+++ b/scan.go
@@ -10,6 +10,11 @@ import (
 	"gorm.io/gorm/schema"
 )
 
+const (
+	// DoubleUnderscore for FieldSchema.LookUpField or column Alias Delimiter
+	DoubleUnderscore = "__"
+)
+
 func prepareValues(values []interface{}, db *DB, columnTypes []*sql.ColumnType, columns []string) {
 	if db.Statement.Schema != nil {
 		for idx, name := range columns {
@@ -121,9 +126,9 @@ func Scan(rows *sql.Rows, db *DB, initialized bool) {
 				for idx, column := range columns {
 					if field := Schema.LookUpField(column); field != nil && field.Readable {
 						fields[idx] = field
-					} else if names := strings.Split(column, "__"); len(names) > 1 {
+					} else if names := strings.Split(column, DoubleUnderscore); len(names) > 1 {
 						if rel, ok := Schema.Relationships.Relations[names[0]]; ok {
-							if field := rel.FieldSchema.LookUpField(strings.Join(names[1:], "__")); field != nil && field.Readable {
+							if field := rel.FieldSchema.LookUpField(strings.Join(names[1:], DoubleUnderscore)); field != nil && field.Readable {
 								fields[idx] = field
 
 								if len(joinFields) == 0 {
@@ -200,9 +205,9 @@ func Scan(rows *sql.Rows, db *DB, initialized bool) {
 				for idx, column := range columns {
 					if field := Schema.LookUpField(column); field != nil && field.Readable {
 						values[idx] = reflect.New(reflect.PtrTo(field.IndirectFieldType)).Interface()
-					} else if names := strings.Split(column, "__"); len(names) > 1 {
+					} else if names := strings.Split(column, DoubleUnderscore); len(names) > 1 {
 						if rel, ok := Schema.Relationships.Relations[names[0]]; ok {
-							if field := rel.FieldSchema.LookUpField(strings.Join(names[1:], "__")); field != nil && field.Readable {
+							if field := rel.FieldSchema.LookUpField(strings.Join(names[1:], DoubleUnderscore)); field != nil && field.Readable {
 								values[idx] = reflect.New(reflect.PtrTo(field.IndirectFieldType)).Interface()
 								continue
 							}
@@ -219,9 +224,9 @@ func Scan(rows *sql.Rows, db *DB, initialized bool) {
 				for idx, column := range columns {
 					if field := Schema.LookUpField(column); field != nil && field.Readable {
 						field.Set(db.Statement.ReflectValue, values[idx])
-					} else if names := strings.Split(column, "__"); len(names) > 1 {
+					} else if names := strings.Split(column, DoubleUnderscore); len(names) > 1 {
 						if rel, ok := Schema.Relationships.Relations[names[0]]; ok {
-							if field := rel.FieldSchema.LookUpField(strings.Join(names[1:], "__")); field != nil && field.Readable {
+							if field := rel.FieldSchema.LookUpField(strings.Join(names[1:], DoubleUnderscore)); field != nil && field.Readable {
 								relValue := rel.Field.ReflectValueOf(db.Statement.ReflectValue)
 								value := reflect.ValueOf(values[idx]).Elem()