表結構：

資料：

需求：

按照company_id不同分組，然後分別求出相同company_id相鄰記錄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,(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

結果：

以上這篇Mysql 相鄰兩行記錄某列的差值方法就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支援我們。