54、(12-15) choose the best answer:
View the Exhibit and examine the structure of the ORDER_ITEMS and ORDERS tables.
You are asked to retrieve the ORDER_ID, PRODUCT_ID, and total price (UNIT_PRICE multiplied by QUANTITY), where the total price is greater than 50,000.
You executed the following SQL statement:
SELECT order_id, product_id, unit_price*quantity "Total Price"
FROM order_items
WHERE unit_price*quantity > 50000
NATURAL JOIN orders;
Which statement is true regarding the execution of the statement?
A) The statement would not execute because the WHERE clause is before the NATURAL JOIN clause.
B) The statement would not execute because the USING keyword is missing in the NATURAL JOIN clause.
C) The statement would execute and provide the desired result.
D) The statement would not execute because the ON keyword is missing in the NATURAL JOIN clause.
Answer：A
(解析：注意语法，where 子句应该出现在各种连接的语句后面，比如 right outer join 等等。)