MySQL - 如何從嵌套表中刪除select時使用該表？

Question

我試圖做這樣的事情：

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不會讓我有在嵌套SELECT table_1。建議？

Answer 1

你可能會收到此錯誤：

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

你應該能夠做到這一點使用MySQL的多表DELETE語法來代替：

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 

上面的查詢應該工作，但作爲我會推薦使用ANSI JOIN語法的一般規則：

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