select 字段1,\'X\' as 字段2 from tableName w; 给表的字段2赋一个默认值X; 相关文章: 2022-12-23 2022-12-23 2022-12-23 2022-12-23 2022-12-23 2022-12-23 2022-12-23 2021-07-15