I'm sorry to prove that daft. :(
generate_series needs the startdate of every project to generate the
specific list of monthnumbers for every project.
To join against this the list needs to have a column with the project_id.
So I get something like this but still I cant reference the columns of
the projects within the query that generates the series.
with projectstart ( project_id, startdate )
as
(
select project_id, startdate
from projects
)
select project_id, m
from projectstart as p
left join (
select p.project_id, to_char ( m, 'YYYYMM' )::integer
from generate_series ( p.startdate,
current_date, '1 month'::interval ) as m
) as x
using ( project_id );
Am 23.01.2013 01:08, schrieb Alexander Gataric:
I would create a common table expression with the series from Filip
and left join to the table you need to report on.
Sent from my smartphone
----- Reply message -----
From: "Andreas" <maps...@gmx.net>
To: "Filip Rembiałkowski" <plk.zu...@gmail.com>
Cc: "jan zimmek" <jan.zim...@web.de>, <pgsql-sql@postgresql.org>
Subject: [SQL] need some magic with generate_series()
Date: Tue, Jan 22, 2013 4:49 pm
Thanks Filip,
with your help I came a step further. :)
Could I do the folowing without using a function?
CREATE OR REPLACE FUNCTION month_series ( date )
RETURNS table ( monthnr integer )
AS
$BODY$
select to_char ( m, 'YYYYMM' )::integer
from generate_series ( $1, current_date, '1 month'::interval )
as m
$BODY$ LANGUAGE sql STABLE;
select project_id, month_series ( createdate )
from projects
order by 1, 2;
Am 22.01.2013 22:52, schrieb Filip Rembiałkowski:
> or even
>
> select m from generate_series( '20121101'::date, '20130101'::date, '1
> month'::interval) m;
>
>
>
> On Tue, Jan 22, 2013 at 3:49 PM, jan zimmek <jan.zim...@web.de> wrote:
>> hi andreas,
>>
>> this might give you an idea how to generate series of dates (or
other datatypes):
>>
>> select g, (current_date + (g||' month')::interval)::date from
generate_series(1,12) g;
>>
>> regards
>> jan
>>
>> Am 22.01.2013 um 22:41 schrieb Andreas <maps...@gmx.net>:
>>
>>> Hi
>>> I need a series of month numbers like 201212, 201301 YYYYMM to
join other sources against it.
>>>
>>> I've got a table that describes projects:
>>> projects ( id INT, project TEXT, startdate DATE )
>>>
>>> and some others that log events
>>> events( project_id INT, createdate DATE, ...)
>>>
>>> to show some statistics I have to count events and present it as a
view with the project name and the month as YYYYMM starting with
startdate of the projects.
>>>
>>> My problem is that there probaply arent any events in a month but
I still need this line in the output.
>>> So somehow I need to have a select that generates:
>>>
>>> project 7,201211
>>> project 7,201212
>>> project 7,201301
>>>
>>> It'd be utterly cool to get this for every project in the projects
table with one select.
>>>
>>> Is there hope?
>>>
>>>
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>>
>>
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