(35)至(37)题基于基于“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)

若要求“查询选修了3门以上课程的学生的学生号”，正确的SQL语句是

A．SELECT S# FROM SC GROUP BY S# WHERE COUNT(*)＞3

B．SELECT S# FROM SC GROUP BY S# HAVING C01LINT(*)＞3

C．SELECT S# FROM SC ORDER BY S# WHERE COUNT(*)＞3

D．SELECT S# FROM SC ORDER BY S# HAVING COUNT(*)＞3

论述需要层次理论与双因素理论的异同。