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查询学生的总成绩，并进行排名，总分重复时不保留名次空缺 SELECT sc.SId, DENSE_RANK（) OVER（ORDER BY sum（sc.score) DESC)排名, sum（sc.score) as sumscore FROM sc GROUP BY sc.SId ORDER BY sumscore DESC;
参考答案和解析
SELECTsno,gradeFROMscWHEREgradeBETWEEN70 AND80ORDERBYgradeASCSELECTsno,gradeFROMscWHEREgrade>=70 ANDgrade=80ORDERBYgradeASC
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ADD（Amount）DESC
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