CREATE OR REPLACE FUNCTION foreach( liste INTEGER[] ) RETURNS SETOF
INTEGER AS $$
DECLARE i INTEGER;
BEGIN FOR i IN 1..icount(liste) LOOP RETURN NEXT liste[i]; END LOOP;
END;
$$ LANGUAGE plpgsql;
CREATE AGGREGATE array_accum ( sfunc = array_append, basetype = anyelement, stype = anyarray, initcond =
'{}'
);
SELECT array_accum( DISTINCT list_id ) FROM bookmarks; array_accum
--------------- {1,2,3,4,5,7}
SELECT * FROM foreach( '{1,2,3,4,5,7}' ); foreach
--------- 1 2 3 4 5 7
On Thu, 23 Mar 2006 20:44:32 +0100, Don Maier <dMaier@genome.stanford.edu>
wrote:
> Good day,
>
> Is it possible to construct an array from an appropriate select
> expression that generates a result set of unknown cardinality?
> To focus on the simple case: Is it possible to construct a one-
> dimensional array from a select of a single column in a table with an
> unknown number of rows?
>
> Conversely, is it possible to construct a (single column) result set
> from a select expression on a one-dimensional array with an unknown
> number of elements?
>
> Thanks for any hints!
>
> Regards,
> Don Maier
>
>
>
> ---------------------------(end of broadcast)---------------------------
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