Re: help w/ SRF function

On 9/17/07, Ow Mun Heng <Ow(dot)Mun(dot)Heng(at)wdc(dot)com> wrote:

> > > CREATE OR REPLACE FUNCTION foo_func(fromdate timestamp, todate
> > > timestamp, code text)

> > > LANGUAGE 'sql' IMMUTABLE STRICT;

> > But If I were to use ALIASINg, I get an error
> >
> > eg: DECLARE
> > DECLARE
> > fromdate ALIAS for $1;
> > todate ALIAS for $2;
> > code ALIAS for $3;
> >
> >
> > ERROR: syntax error at or near "ALIAS"
> > LINE 5: fromdate ALIAS for $1;

> anyone knows how come I can't use the reference fromdate/todate etc or
> use aliases but have to resort to using $1/$2 etc?

You seem to be confusing SQL with PL/pgSQL. If you want variables,
aliases, flow control etc instead of a simple macro, you need to use a
procedural language.

http://www.postgresql.org/docs/8.2/static/xfunc-sql.html
http://www.postgresql.org/docs/8.2/static/plpgsql.html