2020年3月9日
SQL之双重not exists
摘要： 答案： select sname from s where not exists (select * from c where teacher = '程军' and not exists (select * from sc where c.cno = sc.cno and sc.sno = s 阅读全文
posted @ 2020-03-09 22:01 funforever 阅读(1041) 评论(0) 推荐(0)
挑战程序设计竞赛3.1习题：Drying POJ - 3104
摘要： It is very hard to wash and especially to dry clothes in winter. But Jane is a very smart girl. She is not afraid of this boring process. Jane has dec 阅读全文
posted @ 2020-03-09 15:39 funforever 阅读(163) 评论(0) 推荐(0)