OCP 071中文考试题库(cuug内部资料)第8题

OCP 071中文考试题库(cuug内部资料)第8题

本套题库是OCP考试中的071(中文版)试题，由CUUG整理，如有报考OCP认证意向，可以联系cuug咨询老师。

8、请选择最佳答案。

查看INVOICES表中的数据:

INVOICE_ID CURRENCY_CODE RAISED_DATE

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

1 EUR 01-JAN-2019

2 USD 01-FEB-2019

3 JPY 01 -MAR-2019

查看CURRENCIES表中的数据:

CURRENCY_CODE

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

JPY

GPB

CAD

EUR

USD

哪个查询返回CURRENCIES中存在而INVOICES中不存在的货币?

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;