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Re: How to obtain algebraic sum of equal lines

From: Ennio-Sr <nasr(dot)laili(at)tin(dot)it>
To: pgsql-novice(at)postgresql(dot)org
Subject: Re: How to obtain algebraic sum of equal lines
Date: 2006-04-25 21:21:22
Message-ID: 20060425212122.GA13675@deby.ei.hnet (view raw or flat)
Thread:
Lists: pgsql-novice
Hi Oisin and Frank,

* Frank Bax <fbax(at)sympatico(dot)ca> [250406, 16:41]:
> At 04:12 PM 4/25/06, Ennio-Sr wrote:
> 
> >Hi all,
> >Is it possible, given the following table:
> >
> >cod_rif | titolo | quantity |   cmf   |  u_qq  |  mont   | vend |  sum
> >---------+--------+----------+---------+--------+---------+------+-------
> > 26      | aaa    |    -1000 | 6.11098 |  6.176 |  6.1110 | t    | -1000
> > 7       | aaa    |     2500 |  25.455 |      0 | 60.0897 | f    |  2500
> > 28      | bbb    |     2700 |   3.862 |    4.6 |  4.1957 | f    |  2700
> > 3       | bbb    |      500 |   6.057 | 10.129 | 18.7311 | f    |   500
> > 34      | bbb    |     -700 |       0 |      0 |  0.0000 | t    |  -700
> > 6       | bbb    |     -500 |   2.703 |  4.757 |  3.7151 | f    |  -500
> > 30      | ccc    |     5000 |   1.717 |  1.489 |  1.7170 | f    |  5000
> > 33      | ccc    |    10000 |    4.36 |      0 |  4.3600 | f    | 10000
> > 11      | ddd    |    -1500 |  10.537 |  4.021 | 20.5815 | t    | -1500
> > 32      | ddd    |     1500 | 0.55896 |  1.119 |  0.5590 | f    |  1500
> >(10 rows)
> >
> >to get a selection whereby the algebraic sum of "quantity" for each equal 
> >'titolo'
> >is returned?
> >
> >I tried this query with no result:
> >psql finanza -c "select * , (sum(quantity)) from  test_t group by cod_rif, 
> >titolo, quantity, cmf, u_qq, mont, vend order by titolo asc"
> 
> psql finanza -c "select titilo, (sum(quantity)) from  test_t group by 
> titolo order by titolo asc"
> 

The point is that command would return two cols only, whereas I would
like to have all the cols, like:

 26      | aaa    |     1500 | 6.11098 |  6.176 |  6.1110 | t    |  1500
 28      | bbb    |     2000 |   3.862 |    4.6 |  4.1957 | f    |  3200

i.e. aaa=(-1000+2500=1500), bbb=(2700+500-700-500)=2000
which, I fear, is not possible ;-(

-- 
[Perche' usare Win$ozz (dico io) se ..."anche uno sciocco sa farlo.   \\?//
 Fa' qualche cosa di cui non sei capace!"  (diceva Henry Miller) ]    (°|°)
[Why use Win$ozz (I say) if ... "even a fool can do that.              )=(
 Do something you aren't good at!" (as Henry Miller used to say) ]

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Subject: Re: How to obtain algebraic sum of equal lines
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