税收的特征是强制性、无偿性、不确定性。（）

该题基于“学生-选课-课程”数据库中的3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 COUNT(*)＞3

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

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