SQL分组排序去重复的小实例

复制代码 代码如下:

SELECT php
    *
FROM
    (
        SELECT
            userid,
            classid,
            remark,
      &n 编程 bsp;     ROW_NUMBER () OVER (
                android PARTITION BY userid,
                classid
            ORDER BY
          &nbs lsIkzwUSEr p;     addtime DESC
            ) AS row_bank
   &nb android sp;    FROM
            Eng24VIPCourseIntention
    ) AS ta
WHERE
    row_bank = 1

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

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