On 09/15/11 19:40, Andreas wrote:
> Hi,
> is there a clever way to check overlapping time intervals ?
> An option named n should be taken from date y to y.
> The same name is ok for another interval.
>
> e.g. table : mytab ( d1 date, d2 date, n text, v text )
>
> There should be a constraint to provide no row can have a d1 or d2
> within the interval of another row in case they have the same n.
>
> And no row can have an interval that encloses an existing interval.
>
self join with "OVERLAPS" operator:
select t1.*,t2.* from (select * from mytab) as t1 full join (select * from mytab) as t2 where (t1.d1,t1.d2)
overlaps(t2.d1,t2.d2)