Get total hours worked in a day mysql

Question

I have a MySQL table where employee login and logout timings are recorded. Here in the in-out column 1-represents login and 0-represents logout.

  [id]   [Us         


        

Answer 1

Give this a try:

select [User_id], sum([Time_count])/3600
from (
  select [User_id],
         case when [in_out]=1 then   UNIX_TIMESTAMP([Date_time])
              when [in_out]=0 then - UNIX_TIMESTAMP([Date_time])
              end as [Time_count]
  from my_table
) as a
group by [User_id]

I don't know MySQL syntax so if someone finds errors, please correct them. Maybe could not work. For example if you have a user logged in. In that case you can filter only the users that has the same number of 1's and 0's in the [in_out] field.