标签: mysql
我有以下查询,但我希望附件首先按降序排序,然后按网址分组。
SELECT _id FROM Attachments GROUP BY url
我怎样才能达到同样的目标?
答案 0 :(得分:2)
我认为你可以这样做
SELECT * FROM(SELECT _id,url FROM Attachments ORDER BY date desc) AS a GROUP BY url