Fwd: Re: question - plpgsql and query on table given by variable

Thank you for your reply. It helped me, but I need know some results. So I tryed use SELECT INTO in EXECUTE string and it do not work. Also I try this:

CREATE OR REPLACE FUNCTION n(varchar) RETURNS varchar AS $$
DECLARE
a varchar;
BEGIN
a := $1;
PERFORM * FROM b;
EXECUTE 'PERFORM AsText(the_geom) FROM ' || a || ';';
IF FOUND THEN
RETURN 'yes';
END IF;
IF FOUND THEN
RETURN 'no';
END IF;
RETURN 'I do not know';
END;
$$ LANGUAGE plpgsql;

Error:
SELECT n('b');
ERROR: syntax error at or near "PERFORM" at character 1
QUERY: PERFORM AsText(the_geom) FROM b;
CONTEXT: PL/pgSQL function "n" line 7 at execute statement
LINE 1: PERFORM AsText(the_geom) FROM b;

When I use PPERFORM in normal way, it works. How I can reach some results from the query executed by EXECUTE?

Thanks for your help