oracle分组取每组第一条数据
oracle分组后取每组第一条数据
‘数据格式
![](http://up.2cto.com/2013/0723/20130723091459799.jpeg)
分组取第一条的效果
![](http://up.2cto.com/2013/0723/20130723091508387.jpeg)
[sql] SELECT * FROM (SELECT ROW_NUMBER() OVER(PARTITION BY x ORDER BY y DESC) rn, test1.* FROM test1) WHERE rn = 1 ;
posted on 2017-06-17 11:01 yjbjingcha 阅读(1723) 评论(0) 编辑 收藏 举报
[sql] SELECT * FROM (SELECT ROW_NUMBER() OVER(PARTITION BY x ORDER BY y DESC) rn, test1.* FROM test1) WHERE rn = 1 ;
posted on 2017-06-17 11:01 yjbjingcha 阅读(1723) 评论(0) 编辑 收藏 举报