2018年的OCP 11g题库解析暂告一段落,关于12c的OCP解析公开课正在进行中,课程包括071、062、063三个科目,这里为您带来的是最新版的071考试题库解析,帮大家顺利通过OCP的071考试。
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071考题大全-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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