diff --git a/internal/statements/insert.go b/internal/statements/insert.go
index 0bb656ca..aa396431 100644
--- a/internal/statements/insert.go
+++ b/internal/statements/insert.go
@@ -89,7 +89,7 @@ func (statement *Statement) GenInsertSQL(colNames []string, args []interface{})
 		}
 
 		if statement.Conds().IsValid() {
-			if err := statement.writeString(" SELECT ")(buf); err != nil {
+			if err := statement.writeStrings(" SELECT ")(buf); err != nil {
 				return "", nil, err
 			}
 
diff --git a/internal/statements/legacy_select.go b/internal/statements/legacy_select.go
index 7f55c822..144ad96d 100644
--- a/internal/statements/legacy_select.go
+++ b/internal/statements/legacy_select.go
@@ -18,7 +18,7 @@ func (statement *Statement) isUsingLegacyLimitOffset() bool {
 // write mssql legacy query sql
 func (statement *Statement) writeMssqlLegacySelect(buf *builder.BytesWriter, columnStr string) error {
 	return statement.writeMultiple(buf,
-		statement.writeString("SELECT"),
+		statement.writeStrings("SELECT"),
 		statement.writeDistinct,
 		statement.writeTop,
 		statement.writeFrom,
diff --git a/internal/statements/query.go b/internal/statements/query.go
index 492fe915..cf367ea5 100644
--- a/internal/statements/query.go
+++ b/internal/statements/query.go
@@ -249,9 +249,9 @@ func (statement *Statement) writeDistinct(w *builder.BytesWriter) error {
 
 func (statement *Statement) writeSelectColumns(columnStr string) func(w *builder.BytesWriter) error {
 	return statement.groupWriteFns(
-		statement.writeString("SELECT"),
+		statement.writeStrings("SELECT"),
 		statement.writeDistinct,
-		statement.writeString(columnStr),
+		statement.writeStrings(" ", columnStr),
 	)
 }
 
diff --git a/internal/statements/writer.go b/internal/statements/writer.go
index b0a8b5c7..b4ca8047 100644
--- a/internal/statements/writer.go
+++ b/internal/statements/writer.go
@@ -10,19 +10,17 @@ import (
 	"xorm.io/builder"
 )
 
-func (statement *Statement) writeString(str string) func(w *builder.BytesWriter) error {
+func (statement *Statement) writeStrings(strs ...string) func(w *builder.BytesWriter) error {
 	return func(w *builder.BytesWriter) error {
-		if _, err := fmt.Fprint(w, str); err != nil {
-			return err
+		for _, str := range strs {
+			if _, err := fmt.Fprint(w, str); err != nil {
+				return err
+			}
 		}
 		return nil
 	}
 }
 
-func (statement *Statement) writeSpace(w *builder.BytesWriter) error {
-	return statement.writeString(" ")(w)
-}
-
 func (statement *Statement) groupWriteFns(writeFuncs ...func(*builder.BytesWriter) error) func(*builder.BytesWriter) error {
 	return func(bw *builder.BytesWriter) error {
 		return statement.writeMultiple(bw, writeFuncs...)