Re: crosstab function - pivot - use column value as column description

See bottom.

Am 12.01.2010 22:00, schrieb Merlin Moncure:
> On Tue, Jan 12, 2010 at 3:27 PM, Daniel Schuchardt
> <d.schuchardt@prodat-sql.de>  wrote:
>
>> Hy,
>>
>> i'm looking for a solution to get this table dynamicaly in that resultset:
>>
>> SELECT r_dbrid, r_kategorie AS column_name, r_descr AS value FROM
>> recnokeyword WHERE r_dbrid=X
>>   r_dbrid  | r_kategorie |  r_descr
>> ----------+-------------+------------
>>   14725737 |material | Alu Sorte1
>>   14725737 |farbe | Blau
>>   14725737 |gewicht | 100 kg
>>
>> ---->
>>
>> material | farbe | gewicht
>> ----------+-------------+------------
>> alu sorte 1|blau | 100kg
>>
>> ---->  the number of columns depends on data.
>>
>> is there is a simple solution for that?
>>
> have you ruled out the appropriate contrib module?
>
> http://www.postgresql.org/docs/8.4/static/tablefunc.html
>
> merlin
>
>

yes, but that function requires a return type -> so i has to know how
many columns. also the column description ist defined by data but by
return type.

(

SELECT * FROM crosstab('...', '...')
       AS ct(row_name text, extra text, cat1 text, cat2 text, cat3 text, cat4 text);


This will produce a result something like:

                               <==  value  columns   ==>
            row_name   extra   cat1   cat2   cat3   cat4

)

Daniel
--

Daniel Schuchardt
/Softwareentwicklung/

/http://www.prodat-sql.de/