Marcin Stępnicki wrote: > Now I need to create a query to find hours at which each of the type can > start. So, if it's event A (which take 15 minutes) it can start at: > > 8:00 (to 8:15) > 8:15 (to 8:30) > ( 8:30 to 8:45 is already taken ) > 8:45 (to 9:00) > 9:00 (to 9:15) > 9:15 (to 9:30) > ( 9:30 to 10:00 (9:30-9:45 and 9:45-10:00) is already taken)) > 10:00 (to 10:15)
I think something like this should help you: select my_hour from test_events right join test_timeline on ((start, finish) overlaps (my_hour, my_hour + 15 * '1 minute'::interval)) where start is null; With your test data, it shows all the times except for 8:30, 9:30 and 9:45. ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
