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以下三个小题基于“学生选课课程”数据库中的如下三个关系:学生基本信息:S(S#,SNAME,SEX,AGE) 选课信息:SC(S#,C#,GRADE) 课程信息:C(C#,CNAME,TEACHER)...

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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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