--如果 field1 为 null,则返回 0,否则返回数据库中存储的字段值。SELECT ISNULL(field1, 0) FROM table1; 相关文章: 2022-01-07 2022-12-23 2021-05-26 2022-12-23 2021-10-07 2022-12-23 2021-10-15