摘要: 1. 先讨论 in 与 not in中存在NULL的情况, sql语句如下: 1 select 1 result1 from dual where 1 not in (2, 3); 2 3 4 select 1 result2 from dual where 1 not in (2, 3, nu... 阅读全文
posted @ 2014-09-25 10:12 tarbitrary 阅读(2762) 评论(0) 推荐(2) 编辑