diff --git a/internal/statements/query.go b/internal/statements/query.go
index 137ad02f..cc559c45 100644
--- a/internal/statements/query.go
+++ b/internal/statements/query.go
@@ -382,10 +382,7 @@ func (statement *Statement) GenExistSQL(bean ...interface{}) (string, []interfac
 		return statement.GenRawSQL(), statement.RawParams, nil
 	}
 
-	var sqlStr string
-	var args []interface{}
 	var joinStr string
-	var err error
 	var b interface{}
 	if len(bean) > 0 {
 		b = bean[0]
@@ -404,45 +401,61 @@ func (statement *Statement) GenExistSQL(bean ...interface{}) (string, []interfac
 	if len(tableName) <= 0 {
 		return "", nil, ErrTableNotFound
 	}
-	if statement.RefTable == nil {
-		tableName = statement.quote(tableName)
-		if len(statement.JoinStr) > 0 {
-			joinStr = statement.JoinStr
-		}
+	if statement.RefTable != nil {
+		return statement.Limit(1).GenGetSQL(b)
+	}
 
+	tableName = statement.quote(tableName)
+	if len(statement.JoinStr) > 0 {
+		joinStr = " " + statement.JoinStr + " "
+	}
+
+	buf := builder.NewWriter()
+	if statement.dialect.URI().DBType == schemas.MSSQL {
+		if _, err := fmt.Fprintf(buf, "SELECT TOP 1 * FROM %s%s", tableName, joinStr); err != nil {
+			return "", nil, err
+		}
 		if statement.Conds().IsValid() {
-			condSQL, condArgs, err := statement.GenCondSQL(statement.Conds())
-			if err != nil {
+			if _, err := fmt.Fprintf(buf, " WHERE "); err != nil {
 				return "", nil, err
 			}
-
-			if statement.dialect.URI().DBType == schemas.MSSQL {
-				sqlStr = fmt.Sprintf("SELECT TOP 1 * FROM %s %s WHERE %s", tableName, joinStr, condSQL)
-			} else if statement.dialect.URI().DBType == schemas.ORACLE {
-				sqlStr = fmt.Sprintf("SELECT * FROM %s WHERE (%s) %s AND ROWNUM=1", tableName, joinStr, condSQL)
-			} else {
-				sqlStr = fmt.Sprintf("SELECT 1 FROM %s %s WHERE %s LIMIT 1", tableName, joinStr, condSQL)
+			if err := statement.Conds().WriteTo(buf); err != nil {
+				return "", nil, err
 			}
-			args = condArgs
-		} else {
-			if statement.dialect.URI().DBType == schemas.MSSQL {
-				sqlStr = fmt.Sprintf("SELECT TOP 1 * FROM %s %s", tableName, joinStr)
-			} else if statement.dialect.URI().DBType == schemas.ORACLE {
-				sqlStr = fmt.Sprintf("SELECT * FROM  %s %s WHERE ROWNUM=1", tableName, joinStr)
-			} else {
-				sqlStr = fmt.Sprintf("SELECT 1 FROM %s %s LIMIT 1", tableName, joinStr)
+		}
+	} else if statement.dialect.URI().DBType == schemas.ORACLE {
+		if _, err := fmt.Fprintf(buf, "SELECT * FROM %s%s WHERE ", tableName, joinStr); err != nil {
+			return "", nil, err
+		}
+		if statement.Conds().IsValid() {
+			if err := statement.Conds().WriteTo(buf); err != nil {
+				return "", nil, err
 			}
-			args = []interface{}{}
+			if _, err := fmt.Fprintf(buf, " AND "); err != nil {
+				return "", nil, err
+			}
+		}
+		if _, err := fmt.Fprintf(buf, "ROWNUM=1"); err != nil {
+			return "", nil, err
 		}
 	} else {
-		statement.Limit(1)
-		sqlStr, args, err = statement.GenGetSQL(b)
-		if err != nil {
+		if _, err := fmt.Fprintf(buf, "SELECT 1 FROM %s%s", tableName, joinStr); err != nil {
+			return "", nil, err
+		}
+		if statement.Conds().IsValid() {
+			if _, err := fmt.Fprintf(buf, " WHERE "); err != nil {
+				return "", nil, err
+			}
+			if err := statement.Conds().WriteTo(buf); err != nil {
+				return "", nil, err
+			}
+		}
+		if _, err := fmt.Fprintf(buf, "LIMIT 1"); err != nil {
 			return "", nil, err
 		}
 	}
 
-	return sqlStr, args, nil
+	return buf.String(), buf.Args(), nil
 }
 
 // GenFindSQL generates Find SQL