A.原子性 B.隔離性 C.一致性 D.即時(shí)性
A.SELECT * FROM (SELECT * FROM EMPLOYEES ORDER BY SALARY ); B.SELECT * FROM (SELECT * FROM EMPLOYEES ORDER BY SALARY ) WHERE ROWNUM<=3; C.SELECT * FROM (SELECT * FROM EMPLOYEES ORDER BY SALARY DESC) WHERE ROWNUM<=3; D.SELECT * FROM EMPLOYEES WHERE ROWNUM<=3 ORDER BY SALARY DESC;
A.類定義時(shí) B.使用對象的屬性 C.使用對象的方法時(shí) D.對象被創(chuàng)建時(shí)