MySQL多表刪除語法

我嘗試在一箇中刪除查詢。例如：MySQL多表刪除語法

DELETE FROM `comments` WHERE `article_id` = 4; 
DELETE FROM `aricles` WHERE `id` = 4;

我試圖用一個單一的查詢：

DELETE `articles`, `comments` 
FROM `articles` INNER JOIN `comments` 
WHERE `comments`.`article_id` = `articles`.`id` AND `articles`.`id` = 4

如果表comments存在的記錄與article_id 4行之有效，但不與articles刪除articles記錄。 id = 4，如果在comments記錄中article_id = 4未找到。有沒有辦法做到這一點？

2012-03-13 Harry

你真的應該看看約束。請參閱http://stackoverflow.com/questions/3433975/why-use-foreign-key-constraints-in-mysql – Rufinus 2012-03-13 11:37:11

這將做到這一點 -

DELETE `articles`, `comments` 
FROM `articles` 
LEFT JOIN `comments` 
    ON `articles`.`id` = `comments`.`article_id` 
WHERE `articles`.`id` = 4;

2012-03-13 11:53:58 nnichols

這也會刪除沒有「評論」的「文章」。這更準確地回答了這個問題。 – sulai 2013-09-13 12:35:28

嘗試以下操作：

DELETE FROM `articles`, `comments` 
USING `articles` INNER JOIN `comments` 
WHERE `comments`.`article_id` = `articles`.`id` AND `articles`.`id` = 4

2012-03-13 11:44:50

這將*不*刪除沒有'評論'的'文章'。 – sulai 2013-09-13 12:34:02

使用此

DELETE FROM `articles`, `comments` 
USING `articles`,`comments` 
WHERE `comments`.`article_id` = `articles`.`id` AND `articles`.`id` = 4

或

DELETE `articles`, `comments` 
FROM `articles`, `comments` 
WHERE `comments`.`article_id` = `articles`.`id` AND `articles`.`id` = 4

2015-02-20 05:07:01

回答