摘要: use stu --1 select sno,cno,grade from sc where sno in ( select sno from student where sdept = 'CS' ) --2 select cno from course where cno in( select c 阅读全文
posted @ 2025-04-24 08:41 嘉君 阅读(79) 评论(0) 推荐(0)