group by和order by配合使用注意

对于sql server来说：

GROUP BY和ORDER BY同时存在的情况是，ORDER　BY对GROUP BY后的结果再进行排序的，所以ORDER BY后面的排序字段需要在SELECT里出现的，即ORDER BY 子句中的列必须包含在聚合函数或 GROUP BY 子句中。

如：

下面这个就是错的


SELECT  [col1] ,[col2]  FROM  [tb]  GROUP  BY  [col1] ,[col2]   ORDER  BY  [col1] ,[col2] ,[col3]

而下面的都是对的

SELECT  [col1] ,[col2], MAX ([col3])  FROM  [tb]  GROUP  BY  [col1] ,[col2]   ORDER  BY  [col1] ,[col2] , MAX ([col3])
SELECT  [col1] ,[col2], MAX ([col3])  AS   [col3]  FROM  [tb]  GROUP  BY  [col1] ,[col2]   ORDER  BY  [col1] ,[col2] ,[col3]
SELECT  [col1] ,[col2]  FROM  [tb]  GROUP  BY  [col1] ,[col2] ,[col3]  ORDER  BY  [col1] ,[col2] ,[col3]

但是mysql没有上面的要求，如SELECT * FROM account_withdraw_records GROUP BY STATUS可以正常执行。