Thread: Null set

This is a function I am working on:

CREATE FUNCTION authenticate(int4) RETURN boolean
AS 
'SELECT * INTO tmp FROM user WHERE user_id = id;
if SET_IS_NULL(tmp)   return false;
else   return true;'
LANGUAGE 'sql';

My question is: Is there a way to implement the SET_IS_NULL function in
pl/pgsql? 


-- 
Wei Weng
Network Software Engineer
KenCast Inc.