OCP 071中文考試題庫(cuug內(nèi)部資料)第8題

本套題庫是OCP考試中的071(中文版)試題，由CUUG整理，如有報考OCP認證意向，可以聯(lián)系cuug咨詢老師。

8、請選擇最佳答案。

查看INVOICES表中的數(shù)據(jù):

INVOICE_ID CURRENCY_CODE RAISED_DATE

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

1 EUR 01-JAN-2019

2 USD 01-FEB-2019

3 JPY 01 -MAR-2019

查看CURRENCIES表中的數(shù)據(jù):

CURRENCY_CODE

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

JPY

GPB

CAD

EUR

USD

哪個查詢返回CURRENCIES中存在而INVOICES中不存在的貨幣?

A) SELECT * FROM currencies

WHERE NOT EXISTS (

SELECT NULL FROM invoices WHERE currency_code = currency_code

);

B) SELECT * FROM currencies

MINUS

SELECT * FROM invoices;

C) SELECT currency_code FROM currencies

MINUS

SELECT currency_code FROM invoices;

D) SELECT currency_code FROM currencies

INTERSECT

SELECT currency_code FROM invoices;