1

我有两张桌子。T1有t1field1和t1field2,T2有t2field1和t2field2. T2如果t2field1值不存在，我想从中删除所有记录t1field1

+----------+----------+
| t1field1 | t1field2 |
+----------+----------+
|   1      |    x     |
|   5      |    y     |
|   6      |    z     |
+----------+----------+

+----------+----------+
| t2field1 | t2field2 |
+----------+----------+
|   3      |    x     |
|   4      |    y     |
|   5      |    z     |
+----------+----------+
4

3 回答 3

3

尝试这个：

DELETE t2
FROM t2 LEFT JOIN t1 ON t1.t1field1 = t2.t2field1
WHERE t1.t1field1 IS NULL

或者

DELETE FROM t2 WHERE t2.t2field1 NOT IN (SELECT t1.t1field1 FROM t1)
于 2013-12-11T12:58:49.147 回答
1

尝试这个

  DELETE FROM T2 
  WHERE t2field1 NOT IN (SELECT t1field1 FROM T1)
于 2013-12-11T13:01:15.700 回答
1 
delete t2
from t2
left join t1 on t1.t1field1 = t2.field1
where t1.field1 is null
于 2013-12-11T12:56:20.527 回答