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: 2021-06-18 2021-10-19 2021-09-17 2021-09-06 2021-11-13 2021-11-21 2021-08-30 2021-07-30