Re: Extracting data by months

Actually, PostgreSQL has specific function for this purpose. The query would
be:

SELECT * FROM table WHERE date_part('month', date_field) = '8';

(example to select month 8)

If you use date_trunc, the selection will be by month/year - that is,
date_trunc('month', date_field) will always result in the 1st monthday of the
month. The year will be preserved.

Daniel

>>>John McKown said:
> This might seem rather silly, but could you simply do something like:
>
> select * from database
> where date_field >= '01/01/2000'::date
> and date_field < '02/01/2000'::date;
>
> Of course, if date_field could contain many different years, then this
> would not get you the result you wanted.
>
> John
>
> On Thu, 3 Aug 2000, Antti Linno wrote:
>
> > Lo.
> >
> > I'm in dire need of knowledge, how to extract data by month. Monthday
> > and year arent' important, those I can't give from perl script, but what
> > I do give to postgres are the numbers of the months. Date field is in
> > timestamp. I thought about date_trunc, but I can't think of, how to get
> > data with it. In script will be 12 queries, for each month, to get the
> > news from that month.
> > Btw, is there somewhere a manual about date_trunc, the docs that come with
> > RH6.1 distribution are somewhat short and lacking explanation of
> > date_trunc.
> > Antti
> >
> >
>