-- Fail to change the ISOK_QUERIES.IQName
UPDATE isok_queries
  SET iqname = 'queryA'
  WHERE iqname = 'query1';
ERROR:  Error on UPDATE of public.ISOK_QUERIES
DETAIL:  Value (IQName) = (query1): public.ISOK_QUERIES.IQName cannot be changed
CONTEXT:  PL/pgSQL function isok_queries_update_func() line 11 at RAISE