sql 中如何查询某一列的数据在另一个表中有没有?
摘要:假设表table1,列a,表table2,列bselect a from table1where a not in(select b from table2)
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posted @ 2016-04-26 11:33
posted @ 2016-04-26 11:33
posted @ 2016-04-13 09:26
posted @ 2016-04-08 08:48
posted @ 2016-04-01 09:32
posted @ 2016-04-01 08:48