| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com>, pgsql-performance <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Forcing filter/join order? |
| Date: | 2004-02-19 17:39:12 |
| Message-ID: | 200402190939.12479.josh@agliodbs.com |
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| Lists: | pgsql-performance |
Tom,
> Uh, why do you need the child table?
Because there's linked information which needs to be kept by day for multi-day
events. Also, it makes calendar reports easier, where one wants each day of
a multi-day event to appear on each day of the calendar.
>Seems like the correct incantation
> given an assumption about maximum duration is
>
> event_date <= 'end-date' AND (event_date + duration) >= 'start-date'
> AND event_date >= 'start-date' - 'max-duration'
Hmmmm ... so the same as what I have, only with the extra condition for
event_date+duration and without the IN clause. I'll try it, thanks!
--
-Josh Berkus
Aglio Database Solutions
San Francisco
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