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分类: Oracle

2019-12-16 13:26:53

Choose two

Exanine the desatption of the BOOKS_TRANSACTIONS table

Name Null? Type

----------------------------------------------------------------------------------------------

TRANSACTION_ID     NOT NULL  VARCHAR2(6)

TRANSACTION_TYPE                    VARCHAR2(3)

BORROWED_DATE                        DATE

BOOK_ID                                      ARCHAR2(6)

MEMBER_ID                                 VARCHAR2(6)

Examine this partial SQL statement:

SELECT * FROM books_transctions;

Which two WHERE condtions give the same resut?

A) WHERE borrowed_date = SYSDATE AND (transaction_type= 'RM' OR member_id IN

('A101','A102' ) );

B) WHERE borrowed_date = SYSDATE AND transaction_type= 'RM' OR member_id IN

('A101','A102' ) ;

C) WHERE borrowed_date = SYSDATE AND (transaction_type= 'RM' AND member_id='A101' OR

member_id = 'A102') );

D) WHERE (borrowed_date = SYSDATE AND transaction_type= 'RM' ) OR member_id IN

('A101','A102' );

E) WHERE borrowed_date = SYSDATE AND (transaction_type= 'RM' AND ( member_id= 'A101' OR

member_id = 'A102' ) );

Answer::BD

(解析:考的是 and 和 or 的优先级。)

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