摘要:
SELECT * FROM `表名1` WHERE 字段1 in(select sn from 表名1 group by 字段1 having count(*)>1) SELECT sn ,count(*) as a FROM `表名` group by sn having a>1 mysql 使用 阅读全文
摘要:
1、查询数据,以5分钟为一个节点输出 //备注: 100为1分钟,以此类推 SELECT FLOOR(`createtime`/500)*500 as gt FROM `表名` GROUP BY gt 2、查询近一周/一个月/一年的数据 实例:WEEK/周 MONTH/月 YEAR/年 方法:cre 阅读全文