mySQL: 如何在 WHERE IN 子句中删除

Question

我有这个查询

SELECT a.album_id parent, a2.album_id child
FROM album a
LEFT JOIN album a2 ON a2.parent_album_id = a.album_id
WHERE a.album_id = 76

基本上，它 returns 父子值，像这样：

parent      child
--------------------
76          64
76          106

我想使用这些值、父项和所有子项（76、64、106）从另一个 table 中删除

DELETE a, ai
FROM album a
LEFT JOIN album_image ai ON ai.album_id = a.album_id
WHERE a.album_id IN (76,64,106)

执行上述查询，完美运行！但是，我需要查询是动态的。我尝试过但没有成功：

DELETE a, ai
FROM album a
LEFT JOIN album_image ai ON ai.album_id = a.album_id
WHERE a.album_id IN (
    SELECT a.album_id parent, a2.album_id child
    FROM album a
    LEFT JOIN album a2 ON a2.parent_album_id = a.album_id
    WHERE a.album_id = 76
)

我明白为什么它不起作用，因为 where 子句中的子查询 returns 2 值。所以我尝试了 CONCAT_GROUP 和 CONCAT_WS 但没有成功！

我的解决方案是什么？谢谢

Answer 1

你试过吗？

DELETE a, ai
FROM album a
LEFT JOIN album_image ai ON ai.album_id = a.album_id
WHERE a.album_id IN (
    SELECT a.album_id parent
    FROM album a
    LEFT JOIN album a2 ON a2.parent_album_id = a.album_id
    WHERE a.album_id = 76
)
or  a.album_id IN (
    SELECT a2.album_id child
    FROM album a
    LEFT JOIN album a2 ON a2.parent_album_id = a.album_id
    WHERE a.album_id = 76
)

Answer 2

MySQL 如果您尝试在同一个查询中从同一个 table 中执行 SELECT 和 DELETE 通常是不愉快的——即使 SELECT 在子查询中.

但您可以在 DELETE 查询中进行更多联接。

DELETE a, ai
FROM album a
LEFT JOIN album_image ai ON ai.album_id = a.album_id
LEFT JOIN album p ON a.parent_album_id = p.album_id
WHERE a.album_id = 76 OR p.album_id = 76

mySQL: 如何在 WHERE IN 子句中删除

mySQL: How to Delete in WHERE IN clause

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