sql连续排序DENSE_RANK,算出得分(并列第一)

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SELECT creatordepid, DENSE_RANK() OVER (ORDER BY COUNT(creatordepid) DESC) AS MC,
CASE DENSE_RANK() OVER (ORDER BY COUNT(creatordepid) DESC)
            WHEN 1 THEN
                100
            ELSE
                100 - (DENSE_RANK() OVER (ORDER BY COUNT(creatordepid) DESC) - 1) * 5
                END FS
FROM destask GROUP BY creatordepid