填空题
某数据库中有表COURSE(CNO，CNAME，TNO)和表TEACHER(TNO，TNAME，DEPART)，完成查询选修某课程的同学人数多于5人的教师姓名。
SELECT TNAME
FROM TEACHER WHERE
12
(SELECT X.TNO FROM COURSE X，COURSE Y
WHERE 13
14
15 )
SELECT TNAME
FROM TEACHER WHERE
12
(SELECT X.TNO FROM COURSE X，COURSE Y
WHERE 13
14
15 )
【参考答案】
HAVING COUNT(X.CNO)＞5
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