On Wed, 2001-12-19 at 11:11, Louis-David Mitterrand wrote:
> The subselect: (SELECT company_name FROM table)
>
> The output I'd like: 'Company1|Company2|Company3|etc.'
>
> Should I write a function or a new agreggate for this or is there is
> simpler way?
I'm afraid the cleanest way to do this is with an aggregate.
CREATE FUNCTION barjoin(text, text) RETURNS text AS ' SELECT CASE WHEN length($1) > 0 THEN $1 || ''|'' || $2 ELSE $2
END;'LANGUAGE 'sql';
CREATE AGGREGATE barconcat(basetype=text, sfunc=barjoin, stype=text, initcond='');
SELECT barconcat(company_name) FROM table;
If you're in the mood to pointlessly performance tune the snot out of
it, you could implement barjoin to simply do $1|$2, and then write a
final function for the aggregate that trimmed off the beginning |...
--
Andrew G. Hammond mailto:drew@xyzzy.dhs.org
http://xyzzy.dhs.org/~drew/
56 2A 54 EF 19 C0 3B 43 72 69 5B E3 69 5B A1 1F
613-389-5481
5CD3 62B0 254B DEB1 86E0 8959 093E F70A B457 84B1
"To blow recursion you must first blow recur" -- me
