SQL group by的困惑
摘要：
今天为写一条SQL困扰了很久首先先贴两条sql，大家看看有啥区别select * from all_txt A where id=(SELECT id from all_txt where A.key_value = key_value ORDER BY release_time DESC li... 阅读全文
posted @ 2012-01-07 22:20 木鱼哥 阅读(111) 评论(0) 推荐(0) 编辑
