mysql中查询字段为null或者不为null的sql语句怎么写?
时间:2018-11-24 17:58:44
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在mysql中,查询某字段为空时,切记不可用 = null,
而是 is null,不为空则是 is not null
select * from table where column is null;
select * from table where column is not null;
select * from s_class_log WHERE class_uuid="50f3b8ecde184f22ac6bd7304b388b60" AND course_schedules_uuid="940991bff18d4122a4a6471b61ef18f2" and remark_status is not null
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