On Mon, Nov 2, 2009 at 8:35 AM, Jasen Betts <jasen@xxxxxxxxxx> wrote: | | for this case: convert to seconds and then do abs. | | select * from enviados e, recibidos r where abs(extract ( epoch from | (e.fecha - r.fecha) )) < 1 Cheers for that. The query cost is pretty heavy, but the same as the following query which involves two WHERE sections: | select * from enviados e, recibidos r where (e.fecha - r.fecha) < | interval '1 second' AND (r.fecha - e.fecha) < interval '1 second' But both have a higher cost than the following query with "OVERLAPS" | select * from enviados e, recibidos r where (r.fecha + interval '1 | seconds', r.fecha - interval '1 seconds') OVERLAPS (e.fecha, e.fecha); We're only talking about a 4% difference on estimated costs in the billions, but it made me wonder if I should be using OVERLAPS more regularly as it may be more highly optimized. | thanks for sparking an interesting discussion. Thanks. I feel a bit humbled by thinking that I could help add an operator that didn't exist simply because no one had gotten around too it! I realize now that it's a lot more complex of an issue than I thought it was. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
