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(37)~(40)题基于“学生-选课-课程”数据库中的3个关系:S(S#, SNAME, SEX, AGE),SC(S#, C#, GRADE),C(C#, CNAME, TEACHER),它们的主码...

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SELECT S# FROM SC GROUP BY S# WHERE COUNT(*)> 3  SELECT S# FROM SC GROUP BY S# HAVING COUNT(*)> 3  SELECT S# FROM SC ORDER BY S# WHERE COUNT(*)> 3  SELECT S# FROM SC ORDER BY S# HAVING COUNT(*)> 3  
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