mysql - 想要删除多行但不是mysql中相同属性的第一行？

Question

我有一张像

表名：电子邮件值

--------------------------------------
| email                    |   value |
-----------------------------------
|  ab@gmail.com            |  A      |
--------------------------------------
|  ab@gmail.com            |  B      |
--------------------------------------
|  ab@gmail.com            |  C      |
--------------------------------------
|  cccc@gmail.com          |  F      |
--------------------------------------
|  dd@gmail.com            |  G      |
--------------------------------------
|  dd@gmail.com            |  A      |
--------------------------------------
|  dd@gmail.com            |  H      |
--------------------------------------

我想在没有第一行的情况下删除同一电子邮件的所有内容。我将如何纠正我的 sql 中的 sql

SQL 应该删除 mysql 中的这 2 行

--------------------------------------
|  ab@gmail.com            |  B      |
--------------------------------------
|  ab@gmail.com            |  C      |
--------------------------------------   

 and also        

 --------------------------------------
|  dd@gmail.com            |  A      |
 --------------------------------------
|  dd@gmail.com            |  H      |
--------------------------------------

Answer 1

用它：

DELETE t1 FROM emailvalue t1
LEFT JOIN 
(
  SELECT email, value
  FROM emailvalue
  GROUP BY email
) t2 on t2.email = t1.email AND t2.value = t1.value
WHERE t2.value is null;

Answer 2

delete t
from your_table t
left join 
(
  select email, min(value) as minv
  from your_table
  group by email
) x on x.email = t.email and x.minv = t.value
where x.minv is null

Answer 3

ALTER IGNORE TABLE `emailvalue` ADD UNIQUE INDEX(`email`);

MySQL快速从大数据库中删除重复项

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