标签:long rect 关联 最新 options from nat wing blank
12、(5-12)choose two: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
)
【OCP-12c】CUUG最新考试原题整理及答案(071-12)
标签:long rect 关联 最新 options from nat wing blank
原文地址:http://blog.51cto.com/13854012/2350583