From: Greg Sabino Mullane <greg@turnstep.com>
To: pgsql-sql@postgresql.org
Cc: grupos@carvalhaes.net
Subject: Re: SELECT with sum on groups ORDERING by the subtotals
Date: Thu, 16 Jun 2005 19:01:19 -0000
Message-ID: <271d057bf6acfee775e7c47fe899cc9e@biglumber.com> (raw)
In-Reply-To: <42B0F87A.2040503@carvalhaes.net>
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> I need an subtotal for all the products with the same group and that the
> query be ordered by the bigger subtotal.
(please proofread: the subtotals in your example output did not add up)
By "same group" I presume you mean the same code, as you don't actually use
the "group varchar(10)" column you created in your example. A major problem
you have is that you have no other way of ordering the rows except by the
code. So having a running subtotal is fairly pointless, as the items within
each code will appear randomly. Since only the grand total for each code is
significant, you could write something like this:
SELECT t.*, s.subtotal FROM
(SELECT code, SUM(total) AS subtotal FROM test GROUP BY 1) s,
test t
WHERE s.code = t.code
ORDER BY subtotal desc;
code | description | quant | price | total | subtotal
- -------+-------------+-------+-------+-------+----------
99120 | PRODUCT C | 10 | 0.8 | 8 | 338
99120 | PRODUCT C | 100 | 0.8 | 80 | 338
99120 | PRODUCT C | 200 | 0.8 | 160 | 338
99120 | PRODUCT C | 100 | 0.9 | 90 | 338
92110 | PRODUCT A | 10 | 1 | 10 | 120
92110 | PRODUCT A | 5 | 0.9 | 9 | 120
92110 | PRODUCT A | 100 | 0.9 | 90 | 120
92110 | PRODUCT A | 10 | 1.1 | 11 | 120
92190 | PRODUCT b | 10 | 1.1 | 11 | 41
92190 | PRODUCT b | 10 | 1.1 | 11 | 41
92190 | PRODUCT b | 10 | 1.1 | 11 | 41
92190 | PRODUCT b | 20 | 0.8 | 8 | 41
If you don't need all that intermediate stuff:
SELECT code, SUM(total) AS subtotal FROM test GROUP BY 1 ORDER BY 2 DESC;
code | subtotal
- -------+----------
99120 | 338
92110 | 120
92190 | 41
If you do need the other rows, you will have to specify a way of ordering
the rows within a code group.
- --
Greg Sabino Mullane greg@turnstep.com
PGP Key: 0x14964AC8 200506161458
http://biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8
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To: pgsql-sql@postgresql.org
Cc: greg@turnstep.com, grupos@carvalhaes.net
Subject: Re: SELECT with sum on groups ORDERING by the subtotals
In-Reply-To: <271d057bf6acfee775e7c47fe899cc9e@biglumber.com>
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