MySQL 从 AS 中删除答案

【问题标题】：MySQL DELETE FROM ASMySQL 从 AS 中删除
【发布时间】：2015-10-07 21:55:27
【问题描述】：

我正在尝试从可以通过此查询选择的表中删除某种重复项：

SELECT * 
  FROM `articles` AS t1 
 WHERE EXISTS (
                SELECT `id` 
                  FROM articles AS t2 
                 WHERE t2.link = t1.link AND 
                       t2.id > t1.id
               );

所以我尝试了这两个查询，但它们似乎也不起作用：

DELETE FROM `articles` AS t1 
WHERE EXISTS (
              SELECT `id` FROM articles AS t2 
               WHERE t2.link = t1.link AND 
                     t2.id > t1.id
              );

DELETE FROM t1 USING `articles` AS t1 
WHERE EXISTS (
              SELECT `id` 
                FROM `articles` AS t2 
               WHERE t2.link = t1.link AND 
                     t2.id > t1.id
              );

两者都返回语法错误。

【问题讨论】：

#1093 - 您不能在 FROM 子句中指定目标表 't1' 进行更新

标签： mysql sql duplicate-removal sql-delete

【解决方案1】：

您可以在 from 子句中使用多个表：

DELETE t1
FROM   `articles` t1 , `articles` t2
WHERE  t2.link = t1.link AND t2.id > t1.id

【讨论】：

【解决方案2】：

delete
from articles using articles,
    articles a1
where articles.id > a1.id
    and articles.link = a1.link

【讨论】：