Question

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)

似乎MySQL不会让我在嵌套的SELECT中拥有table_1。建议？

Answer 1

您可能收到此错误：

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语法来实现此目的：

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

上述查询应该有效，但作为一般规则，我建议使用ANSI JOIN语法：

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

MySQL - 当嵌套select使用该表时如何从表中删除？

1 个答案: