Joe Conway schrieb:
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 don't like the idea to have a table in another schema in order to create a pivot-like arrangement. Anyway, this wasn't really my need. I got stuck at the very basics (sorry for that) - reading data from a table, doing something with them, like printing to the screen. I tried the example at
http://www.postgresql.org/docs/7.4/static/plpgsql-declarations.html#PLPGSQL-DECLARATION-ROWTYPES
and got the error message something like "table_name returns more then one row...". I cannot recall it accurately since I did it at home and now I'm at work.
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
...at first
Best regards, Torsten
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