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mysql 时间间隔查询

你表中的数据,根据你的题目,应该是全部显示才对。是小于5秒还是5分钟? 下面这个是 两条数据间小于5秒的记录的查询语句 select *,timestampdiff(second,t1.time,(select time from table3 where t1.idid order by id desc limit 1),t1.time ) ...

select * from table where 时间字段 between '2010-7-12 11:18:54' and '2010-7-12 11:22:20'

select count(*) from sometable where datetimecolumn>=UNIX_TIMESTAMP('2010-03-01 00:00:00') and datetimecolumn

select datediff('2009-1-1', '2008-1-1'); 用datediff函数,第一个参数是截止时间,第二个参数是起始时间 不好意思,刚才的是mysql,刚看了下sql的文档发现有点区别- -,sql的话,用下面的形式: DATEDIFF ( datepart , startdate , enddate ) ...

TIMESTAMPDIFF(interval,datetime_expr1,datetime_expr2) www.2cto.com 说明: 返回日期或日期时间表达式datetime_expr1 和datetime_expr2the 之间的整数差。其结果的 单位由interval 参数给出。interval 的法定值同TIMESTAMPADD()函数说明中所列...

SELECT * FROM `tbl` WHERE id IN ( SELECT MAX(id) FROM `tbl` WHERE createdat BETWEEN ADDDATE(DATE_FORMAT(NOW() ,"%Y-%m-%d"), INTERVAL -6 DAY) AND DATE_FORMAT(NOW(),'%Y-%m-%d') GROUP BY DATE_FORMAT(createdat,'%Y-%m-%d') ) 前提你...

SELECT DATE_FORMAT(time,'%Y-%m-%d') as day, sum(case when amount>0 then amount when amount=0 then 0 end) as amount1 from table where time>='2014-11-01' group by day; 我没有测试。time表示日期,amount表示数量。查询11月后每天成交数量

mysql要实现定时执行sql语句就要用到Event 具体操作如下: 先看看看event 事件是否开启 show variables like '%sche%'; 如没开启,则开启。需要数据库超级权限 set global event_scheduler =1; 创建存储过程 update_a (注:就是你要执行的sql语...

TIMESTAMPDIFF(interval,datetime_expr1,datetime_expr2)返回日期或日期时间表达式datetime_expr1 和datetime_expr2the 之间的整数差。其结果的单位由interval 参数给出。该参数必须是以下值的其中一个:FRAC_SECOND 表示间隔是毫秒SECOND 秒MIN...

时间段统计,可以采用 hour(subscribe_time) 取出小时然后分层。思路: select uid ,CASE WHEN HOUR(subscribe_time) BETWEEN 0 AND 1 THEN '00:00:00' WHEN HOUR(subscribe_time) BETWEEN 2 AND 3 THEN '02:00:00' ... ELSE '23:00:00' END -- ...

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