计算具有非连续ID的mysql中两行之间的时间差

Question

I am stuck in problem. I have a table in mysql database, in which I have attendance record of some employees at particular locations.I want to calculate total login time for an employee on specific date. Here is the image of my table. Sorry for formatting.

Answer 1

In sql this is difficult, since you don't have a simple way to match login&logout records together.

For SQL it would go like this (Not tested)

select t1.*, t1.date+t1.time as LoginTimeStamp,
 (select top 1 t2.date+t2.time from table t2 
    where 
         t1.user_id=t2.user_id 
     and t1.location_id=t2.location_id
     and t2.date+t2.time > t1.date+t1.time 
    order by t2.date+t2.time asc) 
 as LogoutTimeStamp
 from table t1 where attendance_status='In'