MySQL #1093 - 您不能在 FROM 子句中指定目标表“赠品"进行更新

MySQL #1093 - You can#39;t specify target table #39;giveaways#39; for update in FROM clause(MySQL #1093 - 您不能在 FROM 子句中指定目标表“赠品进行更新)

问题描述

我试过了:

UPDATE giveaways SET winner = '1' WHERE ID = (SELECT MAX(ID) FROM giveaways)

但它给出了:

#1093 - 您不能在 FROM 子句中指定目标表赠品"进行更新

#1093 - You can't specify target table 'giveaways' for update in FROM clause

这个文章 似乎相关，但我无法使其适应我的查询.我怎样才能让它工作?

This article seems relevant but I can't adapt it to my query. How can I get it to work?

推荐答案

这是因为你的更新可能是周期性的......如果更新该记录会导致发生导致 WHERE 条件 <代码>错误?你知道情况并非如此，但引擎不会.操作中也可能在桌子上存在相反的锁.

This is because your update could be cyclical... what if updating that record causes something to happen which made the WHERE condition FALSE? You know that isn't the case, but the engine doesn't. There also could be opposing locks on the table in the operation.

我认为你可以这样做(未经测试):

I would think you could do it like this (untested):

UPDATE
    giveaways
SET
    winner = '1'
ORDER BY
    id DESC
LIMIT 1

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