摘要: 首先维护一张两点之间的表 tmp: | a | b | | | | | 1 | 2 | insert into tmp select * from tmp t where not exists ( select 1 from tmp where t.b=# and t.a=# ) and not e 阅读全文
posted @ 2021-03-02 11:36 DiligentCoder 阅读(457) 评论(0) 推荐(0) 编辑