• 2022-06-05
    查询选修了数学课(课程号为2)的学生人数,可以使用的查询语句是:  。
    A: SELECT MAX(*) FROM SC WHERE Cno = 2;
    B: SELECT AVG(Sno) FROM SC WHERE Cno = 2;
    C: SELECT COUNT(*) FROM SC WHERE Cno = 2;
    D: SELECT COUNT(Sname) FROM SC WHERE Cno = 2;
  • 举一反三