| From: | Jean-Christophe ARNU (JX) <arnu(at)paratronic(dot)fr> |
|---|---|
| To: | pgsql-general(at)postgresql(dot)org |
| Subject: | SQL speedup on timestamp filtering |
| Date: | 2003-07-22 13:53:28 |
| Message-ID: | 20030722155328.1b467e75.arnu@paratronic.fr |
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| Lists: | pgsql-general |
Hi there :)
I have a large table with (not only but important) timestamp and value
(double) columns.
I would like to "sample" data at given timestamps values (I have one value
each minute and I would like to get each 5 minutes value on a given timestamp
range) and get the corresponding values.
As I'm quite bad at SQL but is there a way with pg to get a timestamp modulo
an interval? Is there a way to optimize this (indexing in a different way,
designing database another way or writting stored procedure that would do the
job efficiently)?
Thanks in advance!
--
Jean-Christophe ARNU
Paratronic
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