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²é¿´PRODUCTS±íµÄ˵Ã÷:

Name Null? Type

----------------- ------------ ---------------

PRODUCT_ID NOT NULL NUMBER(2)

PRODUCT_NAME VARCHAR2 (10)

UNIT_PRICE NUMBER(3)

SURCHARGE VARCHAR2 (2)

EXPIRY_DATE DATE

DELIVERY_DATE DATE

ÄÄÈý¸ö²éѯʹÓõıí´ïʽÓÐЧ?

A) SELECT product_id, unit_price, unit_price + surcharge FROM products;

B) SELECT product_id, unit_price, 5 "Discount", unit_price + surcharge - discount FROM products;

C) SELECT product_id, (unit_price * 0.15 / (4.75 + 552.25)) FROM products;

D) SELECT product_id, unit_price || 5 "Discount", unit_price + surcharge - discount FROM products;

E) SELECT product_id, expiry_date * 2 FROM products;

F) SELECT product_id, (expiry_date - delivery_date) * 2 FROM products;