Re: pivot-like transformation

Torsten Lange wrote:
> Hello,       
> I have a table with measurement values and columns like this:       
> analyses(id, sample_id, parameter[temperatur...], value, unit[?C...], error)       
>        
> With PL/PgSQL at the end I want try to perform a pivot-like arrangement of 
> these data:       
> sample_id|Temperature [?C]|parameter2 [mg/L]|...|parameterN [L/year]       
> ---------+----------------+-----------------+---+-------------------       
>     5    |           23.00|            0.036|...|              35.1       

Not a direct answer with respect to plpgsql, but for pivot table 
functionality see the contrib/tablefunc function crosstab().

> I also found very few sources about handling of arrays and how to fill them up      
> with query results... things like this. Does anyone know a more comprehensive      
> source?  

Have you looked at the online docs?
http://www.postgresql.org/docs/7.4/static/arrays.html
http://www.postgresql.org/docs/7.4/static/functions-array.html
http://www.postgresql.org/docs/7.4/static/functions-comparisons.html
http://www.postgresql.org/docs/7.4/static/sql-expressions.html#SQL-SYNTAX-ARRAY-CONSTRUCTORS

HTH,

Joe