摘要：
select*fromscwhere(selectcount(*)fromscsc2wheresc2.score>sc.scoreandsc2.class=sc.class)<=2orderbysc.class,sc.scoredesc;select*fromschaving(selectcount(*)fromsct1wheret1.class=sc.classandt1.score>=sc.score)<=3;select*fromscwhereexists(selectcount(*)fromscsc2wheresc2.score>sc.scoreandsc 阅读全文
posted @ 2013-03-07 16:39
zuoxingyu
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