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SQL分组排序去重复的小实例

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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 =======================
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。
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