编辑器警告:此解决方案计算效率低下，可能会导致大表的连接中断.

注意 - 您需要首先在您的表的测试副本上执行此操作！

NB - You need to do this first on a test copy of your table!

当我这样做时，我发现除非我还包含了 AND n1.id n2.id，它删除了表中的每一行.

When I did it, I found that unless I also included AND n1.id <> n2.id, it deleted every row in the table.

1. 如果要保留 id 值最低的行:

DELETE n1 FROM names n1, names n2 WHERE n1.id > n2.id AND n1.name = n2.name

DELETE n1 FROM names n1, names n2 WHERE n1.id < n2.id AND n1.name = n2.name

我在 MySQL 5.1 中使用过这种方法

I used this method in MySQL 5.1

不确定其他版本.

更新:由于人们在谷歌上搜索删除重复项最终会出现在这里
尽管 OP 的问题是关于 DELETE，但请注意使用 INSERT 和 DISTINCT 会快得多.对于一个有 800 万行的数据库，下面的查询用了 13 分钟，而使用 DELETE 时，用了 2 个多小时还没有完成.

Update: Since people Googling for removing duplicates end up here
Although the OP's question is about DELETE, please be advised that using INSERT and DISTINCT is much faster. For a database with 8 million rows, the below query took 13 minutes, while using DELETE, it took more than 2 hours and yet didn't complete.

INSERT INTO tempTableName(cellId,attributeId,entityRowId,value)
    SELECT DISTINCT cellId,attributeId,entityRowId,value
    FROM tableName;