Message-ID: <50DDC4D5.8010500@ft-c.de>
Date: Fri, 28 Dec 2012 17:12:05 +0100
From: Franz Timmer <ml@ft-c.de>
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To: pgsql-sql@postgresql.org
Subject: Re: Help with a select statement design
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hello,


(         select 'A' as x, id, price from tab where id = 'value'
union all select 'B' as x, id, ...
union all select 'C' as x, id, ...
union all select 'D' as x, id, price from tab where id = 'value' )

generate a list like
X   id  price
A   1   10
B   2   20
C   3   30
D   4   40

select
max (case when X = 'A' then id   end ) as id_a,
max (case when X = 'A' then price end ) as price_a,
max (case when X = 'B' then id    end ) as id_b,
max (case when X = 'B' then price end ) as price_b,
max (case when X = 'C' then id    end ) as id_c,
max (case when X = 'C' then price end ) as price_c,
max (case when X = 'D' then id    end ) as id_d,
max (case when X = 'D' then price end ) as price_d
from ( table_or_select_from_above )

--- not testet


On 24.12.2012 17:30, JORGE MALDONADO wrote:
> I have a record with the following fields:
> 
> id1, id2, id3, id4, price1, price2, price3, price4
> 
> I would like to write a SELECT statement in order to get 4 records:
> 
> id, price (record that comes from id1 and price 1)
> id, price (record that comes from id2 and price 2)
> id, price (record that comes from id3 and price 3)
> id, price (record that comes from id4 and price 4)
> 
> I will very much appreciate any suggestion.
> 
> Respectfully,
> Jorge Maldonado


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