Mysql 相邻两行记录某列的差值方法
编程学习 2021-07-05 14:36www.dzhlxh.cn编程入门
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表结构：
数据：
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：
以上这篇Mysql 相邻两行记录某列的差值方法就是长沙网络推广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狼蚁SEO。