OCP考试题库以前是比较稳定的,但在2018年随着oracle的调整,不断的有新题出现,增加考试的难度,对此,我们专门收集整理了071的考试真题,分享给大家。
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071题库分享-第32题、choose the best answer:
Examine the structure of the BOOKS_TRANSACTIONS table.
You want to update this table such that BOOK_ID is set to 'INVALID' for all rows where no MEMBER_ID has been entered.
Examine this partial SQL statement:
SQL> UPDATE books_transactions
SET book_id = 'INVALID'
WHERE...............
Which condition must be used in the WHERE clause to perform the required update?
A) MEMBER_ID = "";
B) MEMBER_ID IS NULL;
C) MEMBER_ID = NULL;
D) MEMBER_ID = '';
Answer:B
(解析:该题的题眼在“where no MEMBER_ID has been entered”)
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