Thank you all for the valuable replies.I've also got suggestions to use IS NOT DISTINCT FROM or STRICT at http://stackoverflow.com/questions/35742865/how-to-ensure-that-a-stored-function-always-returns-true-or-false but the former has the edge case of NULL=NULL returning TRUEand with the latter I would have to be careful with the way I call my function -and I am worried I might forget it later and this is a security related...So I will probably use this function:CREATE OR REPLACE FUNCTION check_user(in_social integer, in_sid varchar(255), in_auth varchar(32)) RETURNS boolean AS$func$ SELECT CASE WHEN in_social IS NULL THEN FALSE WHEN in_sid IS NULL THEN FALSE WHEN in_auth IS NULL THEN FALSE ELSE (MD5('secret word' || in_social || in_sid) = in_auth) END;$func$ LANGUAGE sql IMMUTABLE;
RegardsAlex
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