摘要: 方法一:group by (取最小的id)select min(id) id,T from Table_1 group by T方法二:union (不需要id)select T from Table_1 where 1=0unionselect T from Table_1方法三:DISTINC... 阅读全文
posted @ 2015-12-31 09:33 eyye的眼睛 阅读(252) 评论(0) 推荐(0) 编辑