Calculate Time Diff between different column and row [MYSQL] -

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A user is trying to calculate time difference in logout / logout, to do this, Required: 2 Login - 1 Logout, I do not even know how to properly understand, so I will tell the results of the table here:>

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you do this Can you join the table with yourself? Not. This query renders the table that you've posted: 

  SELECT t.login, t.logout, TIMEDIFF (MIN (t2.login), T. Logout) my_table Join T LEFT my_table T2 ON Logout & lt; T2.Login GROUP by t.Logout   
 MIN (T. Login) The next login after t.Logout is

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