Re: Is it possible in PostgreSQL?

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От Chris Travers
Тема Re: Is it possible in PostgreSQL?
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Msg-id 019001c3ddcd$74de3660$8d285e3d@winxp
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Ответы Re: Is it possible in PostgreSQL?
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Moving thread over to SQL list as it belongs there.
 
Bronx:  This certainly is possible, but IMO, not in one query.  Actually doing it will be relatively complex.  For purposes of maintenance, I am thinking that doing this would be better handled by wrapping at least one view.
 
CREATE VIEW sales_pre_proc AS
SELECT name, quantity, to_char("date", 'YYYY') AS year, to_char("date", 'MM') FROM sales;
 
This is needed for the group by statement below to function properly:
CREATE VIEW sales_month_summary AS
SELECT name, sum(quantity) AS quantity, year, month from sales_pre_proc
GROUP BY name, year, month;
 
This will give you a view that will have the sum information.  Now we just have to create the statement which will create the pivot effect.  I understand that there is something under contrib/tablefunc for this, but I do not have it on my system (cygwin), at the moment.  Perhaps someone else can help.  
 
Failing that, you can write your own function to return each row.  I was working on a quick proof of concept but it was not working properly.
 
Best Wishes,
Chris Travers
 
----- Original Message -----
From: Bronx
Sent: Tuesday, January 13, 2004 6:58 AM
Subject: [ADMIN] Is it possible in PostgreSQL?

Hi,
I've got problem with one specific query. I've got the table
with many of rekords like these:
 
name     |  quantity    | date
-------------------------------------------------------
aaa            2                2003-04-01
bbb            4                2003-04-12
ccc            5                2003-05-12
aaa            3                2003-01-14
aaa            1                2003-12-09
bbb            9                2003-08-08
 
and so on ...
 
Does anybody know how make query which return grouped
records by month of year and name (also sum of quantity).
It is possible to make a query whitch return something like that:
 
name | 01 | 02 | 03 | 04 | ... | 12 (months)
------------------------------------------------
aaa     x     x     x    x    ...   x
bbb     x     x     x    x    ...   x
ccc     x     x     x    x    ...   x
 
where x means sum of quantity in month.
It is possible to make it in one query?
I know that in Access is construction : PIVOT.
 
Thanks
Adam
 

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