标签:CUUG 11 12c no been MEMBER table NULL ID
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”)
标签:CUUG,11,12c,no,been,MEMBER,table,NULL,ID 来源: http://blog.51cto.com/13854012/2350503
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