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
{{U}} (12) {{/U}}
(SELECT X.TNO FROM COURSE X，COURSE Y
WHERE {{U}} (13) {{/U}}
{{U}} (14) {{/U}}
{{U}} (15) {{/U}})