Josh,
> > [ stuff deleted ]
> > CREATE FUNCTION metakey (text, int4, int4) returns text as
> > ' SELECT $1 || ' ' || text($2) || ' ' || text($3) '
> > LANGUAGE 'sql';
> >
> > || is the "concatenate text" operator.
> >
> > Change the param types and cast them as you need.
>
> ... But keep in mind that if any of the above values are NULL, the
> whole expression will be NULL. If one or more of the columns allows
> NULLs, you will need a function that includes testing for NULL.
>
> -Josh Berkus
Thanks for the hint. COALESCE is your friend, then :)
Christof.
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