Функция DB2 с несколькими условиями

Question

CREATE OR REPLACE FUNCTION SS_CHECK ()
   RETURNS TABLE
           (ELE_NAME    VARCHAR (50),
            ELE_DESC    VARCHAR (100)
           )
RETURN SELECT ELEMENT_NAME, ELEMENT_NOTE
          FROM (SELECT CHECK_CODE FROM TABLE1)A,
                TABLE (VALUES 
                        ('check_code',A.CHECK_CODE )) Q 
                (ELE_NAME, ELE_DESC);

У меня такая функция. Мой ожидаемый результат

                   Having one condition from other table,if jaw_code=1 means above logic need to give
                   and also jaw_code=2 means,need to check LOGIC_CODE from TABLE2 in this same function.