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.