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【071考试题库】OCP-1Z0-071最新考试题库大全-第32题

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Oracle 12c的OCP考试考3科，分别是071、062、063，对于这些考题，我们专门有人负责收集整理，并由专业的老师对这些考题进行解析，希望可以帮助想考OCP的同学，这里开始介绍071的题库。

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071考试题库-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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