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【2019年8月版本】OCP 071认证考试最新版本的考试原题-53-CUUG整理
OCP的071考试，在8月份左右全部换了新题，近期考试的题也全部不包括之前的题库了，这次oracle更新071考试题库，虽然全都是新题，但跟之前的相比也有关联，比如把之前的考题稍微变换一下数字、更新一下日期、或者再加一个错误选项等等。
对于2019年8月份的更新，我们CUUG已经进行了收集整理，并给出初步的答案和讲解，仅供参考，希望对考OCP 071认证的同学有帮助。
choose two
Which two true about a sql statement using SET openatons such as UNION?
A) The data type of each column returned by the second query must be implldtly convertible to the data type of the corresponding column returned by the first query
B) The data type of each colunn retuned by he second query must exactly match the data type of the corresponding column returned by the first query
C) The number, but not names, of columns must be identical for all SELECT statements in the query
D) The data type group of each column returned by the second query must match the data type group of the corresponding column returned by the first query
E) The names and muntber of columns must be identical for all SELECT statements in the query.
Answer：AC
(解析：union 各个查询语句的列的数量要一样，但是类型不是必须一样，只要是兼容的，可以隐式转换的。)