ERROR: query has no destination for result data

Question

CREATE OR REPLACE FUNCTION _chkLogin(userid varchar, pwd varchar)
RETURNS BOOLEAN AS
$BODY$
DECLARE 
 passed BOOLEAN;
BEGIN
 SELECT  (_password = $2) FROM _vRegistration         


        

Answer 1

You do return passed but you never assign value to it.

And select command within the function has to have place to put data to.

So. Change your SQL to:

SELECT  (_password = $2) INTO passed FROM _vRegistration WHERE _userid = $1;

Also - since you're using names for variables (userid, pwd) use them:

SELECT  (_password = pwd) INTO passed FROM _vRegistration WHERE _userid = userid;