【OCP-12c】CUUG最新考试原题整理及答案（071-11）

11、（5-8） 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”）