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mysql中查詢欄位為null或者不為null的sql語句怎麼寫?

在mysql中,查詢某欄位為空時,切記不可用 = null,
而是 is null,不為空則是 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