mysql - SQL查询删除特定条件的行

Question

我正在尝试为以下内容编写查询

mysql db有两列数据如下

no id
1   1
1   2
1   3
2   4
3   5
3   6
4   7
5   8

我需要为以下条件编写查询

当“no”重复出现时，从数据库中删除所有那些“no”相同且“id”> id 的 min 的“no”

expected output for the above table
no id
1   1
2   4 
3   5
4   7
5   8

Answer 1

DELETE  a
FROM    tableName a
        LEFT JOIN
        (
            SELECT  no, MIN(ID) min_ID
            FROM    tableName
            GROUP   BY no
        ) b ON a.no = b.no AND
                a.id = b.min_ID
WHERE   b.no IS NULL

• > SQLFiddle Demo

反之，

DELETE  a
FROM    tableName a
        INNER JOIN tableName b 
        ON a.no = b.no
WHERE   a.id > b.id

• > SQLFiddle Demo