MySQL - 当嵌套选择使用该表时如何从表中删除？

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 不允许我在嵌套的 SELECT 中包含 table_1。有什么建议吗？

Answer 1

您可能遇到此错误:

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

你应该能够使用 MySQL 的多表来做到这一点 DELETE语法改为:

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

上面的查询应该有效，但作为一般规则，我建议改用 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