大數據就業實戰培訓 Oracle就業實戰培訓
071考試題庫之前是比較穩定的,但隨著Oracle的調整,071考試不斷的增加新的考題,增加了考試的難度,所以我們專門收集整理了這些考試,并對這些考題進行解析,希望可以對考生有幫助。
每周五晚8點,我們有免費的OCP解析公開課,地址:https://ke.qq.com/course/326223 OCP題庫交流群:1015267481,驗證ocp
-------------------------------------------------------
071考試-第13題、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 ,而且必須列的名字要相同,類型可以不同,但是可以隱式轉過去)