2018年的OCP 11g题库解析暂告一段落,关于12c的OCP解析公开课正在进行中,课程包括071、062、063三个科目,这里为您带来的是最新版的071考试题库解析,帮大家顺利通过OCP的071考试。
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13.choose the best answer
Which statement is true regarding the USING clause in table joins?
A) It can be used to access data from tables through equijoins as well as nonequijoins.
B) It can be used to join tables that have columns with the same name and compatible data types.
C) It can be used to join a maximum of three tables.
D) It can be used to restrict the number of columns used in a NATURAL join.
Answer:B
(解析:using 只能用在 equiue join ,而且必须列的名字要相同,类型可以不同,但是可以隐式转过去)
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