MySQL-当嵌套选择使用该表时如何从表中删除？

小编典典

MySQL-当嵌套选择使用该表时如何从表中删除？

sql

我正在尝试做这样的事情：

DELETE FROM table_1
WHERE  table_1.id IN (SELECT table_1.id
                      FROM   table_1,
                             table_2,
                             table_3
                      WHERE  table_1.id = table_2.table_1_id
                      AND    table_2.id = table_3.table_2_id
                      AND    table_3.id = 5)

好像MySQL不允许我table_1在嵌套SELECT中使用。有什么建议吗？

阅读 178

2021-03-23

共1个答案

小编典典

您可能会收到此错误：

ERROR 1093 (HY000): You can't specify target table 'table_1' for update in FROM clause.

您应该能够使用MySQL的多表DELETE语法来做到这一点：

DELETE table_1.*
FROM   table_1,
       table_2,
       table_3
WHERE  table_1.id = table_2.table_1_id
AND    table_2.id = table_3.table_2_id
AND    table_3.id = 5

上面的查询应该可以工作，但是作为一般规则，我建议使用ANSI JOIN语法代替：

DELETE table_1.*
FROM   table_1
INNER JOIN table_2 on table_2.table_1_id = table_1.id
INNER JOIN table_3 on table_3.table_2_id = table_2.id
WHERE table_3.id = 5

2021-03-23