java學(xué)習(xí)
select a.class,a.score from student a where (select count(*) from student where class=a.class and a.score<score)<3order by a.class,a.score desc;
posted on 2018-08-09 14:32 楊軍威 閱讀(526) 評(píng)論(0) 編輯 收藏
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