| From: | Hannu Krosing <hannu(at)tm(dot)ee> |
|---|---|
| To: | Luis Alberto Amigo Navarro <lamigo(at)atc(dot)unican(dot)es> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: please help on query |
| Date: | 2002-07-11 20:51:04 |
| Message-ID: | 1026420664.18193.21.camel@taru.tm.ee |
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| Lists: | pgsql-hackers pgsql-sql |
On Thu, 2002-07-11 at 17:22, Luis Alberto Amigo Navarro wrote:
> I can't improve performance on this query:
You may also want to rewrite
lineitem.shipdate<(('1994-01-01')::DATE+('1 year')::INTERVAL)::DATE
into
lineitem.shipdate<(('1995-01-01')::DATE
if you can, as probably the optimiser will not recognize it else as a
constant and won't use index on lineitem.shipdate.
----------------
Hannu
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