Re: How to GROUP results BY month

am Tue, dem 15.07.2008, um 15:57:54 -0600 mailte Scott Marlowe folgendes:
> On Tue, Jul 15, 2008 at 6:12 AM, Oliveiros Cristina
> <oliveiros(dot)cristina(at)marktest(dot)pt> wrote:
> > Howdy, all,
> >
> > I have a problem.
> >
> > I have a table which one of the fields is of type date.
> >
> > I need to obtain the totals of the other fields in a by-month basis
> > IS there any easy way to do this using the GROUP BY or any other construct?
> >
>
> In addition to the responses on grouping by extract('month' from
> timestamp) you can also index on this function as long as timestamp
> isn't timestamp with timezone. With that index in place, grouping by

You can also create an index on an timestamptz column for a particular
time zone ;-)

test=*# create table foo (ts timestamptz);
CREATE TABLE
test=*# create index foo_idx on foo(extract(month from ts at time zone 'GMT'));
CREATE INDEX

Andreas
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Andreas Kretschmer
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