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Re: How to obtain algebraic sum of equal lines

From: Oisin Glynn <me(at)oisinglynn(dot)com>
To: nasr(dot)laili(at)tin(dot)it, pgsql-novice(at)postgresql(dot)org
Subject: Re: How to obtain algebraic sum of equal lines
Date: 2006-04-25 20:22:14
Message-ID: 444E84F6.7090707@oisinglynn.com (view raw or flat)
Thread:
Lists: pgsql-novice
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" 
>
> Regards,
> 	Ennio.
>
>
>   

Perhaps I am not seeing the light but would the following not give sum 
per titolo?

select sum(quantity),titolo from test_t group by titolo;


Oisin


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