create or replace procedure llx_21
v_bir date;
v_id employg.id%TYPE;
CURSOR c_emp
IS SELECT s_fun8(idcard),id
FROM employg;
BEGIN
OPEN c_emp;
FETCH c_emp INTO v_bir,v_id;
WHILE c_emp %FOUND LOOP
UPDATE employg
SET birthday = v_bir
WHERE id = v_id;
END LOOP;
CLOSE c_emp;
COMMIT;
END;

create function s_fun8(card varchar2) return
date is idate date;
begin
select to_Date(substr(card,7,8),'yyyy-mm-dd') into idate from dual;
return idate;
end;