postgresql - Calculating total working hours based on shifts -


i calculate how many hours each employee has worked time period, based on information table:

       start              employee_id  2014-08-10 18:10:00             5   2014-08-10 13:30:00             7   2014-08-10 09:00:00             7   2014-08-09 23:55:00             4   2014-08-09 16:23:00             12   2014-08-09 03:59:00             9   2014-08-08 20:05:00             7   2014-08-08 13:00:00             8

each employee replaces employee , that's work done, there no empty slots.

the desired format of result following:

employee_id         total_minutes_worked

i'm trying think of best way achieve this, appreciated!

you can total time as:

select employee_id, sum(stop - start)  (     select start, lead(start) on (order start) stop, employee_id     t ) x  group employee_id;

it remains format time, assume not puzzles you


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