兴国资源网 Design By www.nnzcdc.com

表结构:

Mysql 相邻两行记录某列的差值方法

数据:

Mysql 相邻两行记录某列的差值方法

需求:

按照company_id不同分组,然后分别求出相同company_id相邻记录touch_time的差值

SQL:

select r1.company_id,
 r1.touch_time,
 r2.touch_time,
 r1.touch_time - r2.touch_time
 from (select (@rownum := @rownum + 1) as rownum,
  info.company_id,
  info.touch_time
  from sys_touch_info info, (select @rownum := 0) r
  where info.touch_time is not null
  order by info.company_id) r1
 left join (select (@index := @index + 1) as rownum,
   info.company_id,
   info.touch_time
  from sys_touch_info info, (select @index := 0) r
  where info.touch_time is not null
  order by info.company_id) r2
 on r1.company_id = r2.company_id
 and r1.rownum = r2.rownum - 1

结果:

Mysql 相邻两行记录某列的差值方法

以上这篇Mysql 相邻两行记录某列的差值方法就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持。

兴国资源网 Design By www.nnzcdc.com
广告合作:本站广告合作请联系QQ:858582 申请时备注:广告合作(否则不回)
免责声明:本站资源来自互联网收集,仅供用于学习和交流,请遵循相关法律法规,本站一切资源不代表本站立场,如有侵权、后门、不妥请联系本站删除!
兴国资源网 Design By www.nnzcdc.com