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18.choose the best answer

View the Exhibits and examine the structures of the PRODUCTS, SALES, and CUSTOMERS tables.

You issue the following query:

SQL>SELECT p.prod_id,prod_name,prod_list_price,

quantity_sold,cust_last_name

FROM products p NATURAL JOIN sales s NATURAL JOIN customers c

WHERE prod_id =148;

Which statement is true regarding the outcome of this query?

A) It executes successfully.

B) It produces an error because a column used in the NATURAL join cannot have a qualifier.

C) It produces an error because all columns used in the NATURAL join should have a qualifier.

D) It produces an error because the NATURAL join can be used only with two tables.

Answer：B

(解析：執(zhí)行該語句時(shí)返回錯(cuò)誤：

SELECT p.prod_id,prod_name,prod_list_price,

*

第 1 行出現(xiàn)錯(cuò)誤:

ORA-25155: NATURAL 聯(lián)接中使用的列不能有限定詞

)