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基于"学生-选课-课程"数据库中的三个关系S(S#,SNAME,SEX,AGE),SC(S#,C#,GRADE),C(C#,CNAME,TEACHER) 。若要求查找姓名中第一个字为“刘”的学生号和...

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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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