On Fri, Oct 24, 2014 at 11:02 AM, David G Johnston < david.g.johns...@gmail.com> wrote:
> John McKown wrote > >> insert into sales values > >> (tstzrange('2014-1-1', '2014-1-2')), > >> (tstzrange('2014-1-2', '2014-1-3')), > >> (tstzrange('2014-1-2', '2014-1-4')), > >> (tstzrange('2014-1-5', '2014-1-6')); > >> > >> -- want back: > >> -- tstzrange('2014-1-1', '2014-1-4') > >> -- tstzrange('2014-1-6', '2014-1-6') > >> > > I presume the second output row should be [5,6)... > Yes, sorry. And I suppose the third argument to each of those should be '[)'. > > And why are you using a timestamp range when your data are dates? > Didn't want to type our the hours, my my real situation involves timestamptz's. > > My first thought is to explode the ranges into distinct dates, order them > inside a window, use lag(...) to find breaks,p and assign groups, the for > each group take the min and max of the group and form a new range. Not > sure > exactly what the SQL looks like - especially the range explosion - but > should technically work even though performance may suck. Probably want to > use lateral and generate_series(...) if you are on a more recent version. > Thanks! I'll look into this. > > David J. > > > > > > -- > View this message in context: > http://postgresql.1045698.n5.nabble.com/Finding-date-intersections-tp5824102p5824194.html > Sent from the PostgreSQL - general mailing list archive at Nabble.com. > > > -- > Sent via pgsql-general mailing list (pgsql-general@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-general >