Hi,
Peter Eisentraut schrieb:
>
> > today i was trying to perform a query on a database using a time stamp
> > field, i need to get all records which belong to year 2000, month 11,
[...]
> select user_name from tbacct where extract(month from acct_timestamp) = 11 ...
is there any way of using an index for selecting some rows, e.g.
selecting all data from one month?
Explain sais, that the isn't used!
blaster=# explain select id from forum_data where extract(month from
date) = 1; NOTICE: QUERY PLAN: Seq Scan on forum_data (cost=0.00..59.74 rows=3 width=4)
also, I didn't found documentation about "extract" in the PG docs. ups!
;) wher is it, any hints?
In the mailing list archives I found the following hint:
select * from t1 where d >= (date_trunc('month', timestamp 'today') - interval '1 month') and d <
date_trunc('month',timestamp 'today');
it also dosn't use index according to explain ...
My test table has ~350 rows.
Is it possible to use indexes?
or is it better to use an indexed int-field with unixtime? (int8!)
Thanks & Ciao Alvar
--
Alvar C.H. Freude | alvar.freude@merz-akademie.de
Demo: http://www.online-demonstration.org/ | Mach mit!
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