这两年来,OCP的071考试不像以前那么稳定了,总是不断的有新考题出现,增加了071考试的难度,对此,我们对071考试的原题进行了收集,并由专业人员给出了答案,分享给大家。
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071最新题库-第33题、choose two:
Examine the data in the CUSTOMERS table:
You want to list all cities that have more than one customer along with the customer details.
Evaluate the following query:
SQL>SELECT c1.custname, c1.city
FROM Customers c1__________Customers c2
ON (c1.city=c2.city AND c1.custname<>c2.custname);
Which two JOIN options can be used in the blank in the above query to give the correct output?
A) NATURAL JOIN
B) RIGHT OUTER JOIN
C) LEFT OUTER JOIN
D) JOIN
E) FULL OUTER JOIN
Answer:BD
(解析:验证过
A 选项不正确,NATURAL JOIN 自然连接不需要关联条件,所以下面的 ON 子句会报错。
CE 选项不正确,LEFT OUTER JOIN 和 FULL OUTER JOIN 都会显示有客户但是没在某个城市的人
)
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