SQL分组排序去重复的小实例

复制代码 代码如下:

SELECT
*
FROM
(
SELECT
userid,
classid,
remark,
ROW_NUMBER () OVER (
PARTITION BY userid,
classid
ORDER BY
addtime DESC
) AS row_bank
FROM
Eng24VIPCourseIntention
) AS ta
WHERE
row_bank = 1

==========================
PARTITIONBYuserid,classid 这里是按什么分组， 注意一下。