【2019年8月版本】Oracle OCP認證 071考試原題-53
最新學訊：近期OCP認證正在報名中，因考試人員較多請盡快報名獲取最近考試時間，報名費用請聯系在線老師，甲骨文官方認證，報名從速！
我要咨詢【2019年8月版本】OCP 071認證考試最新版本的考試原題-53-CUUG整理
OCP的071考試，在8月份左右全部換了新題，近期考試的題也全部不包括之前的題庫了，這次oracle更新071考試題庫，雖然全都是新題，但跟之前的相比也有關聯，比如把之前的考題稍微變換一下數字、更新一下日期、或者再加一個錯誤選項等等。
對于2019年8月份的更新，我們CUUG已經進行了收集整理，并給出初步的答案和講解，僅供參考，希望對考OCP 071認證的同學有幫助。
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 各個查詢語句的列的數量要一樣，但是類型不是必須一樣，只要是兼容的，可以隱式轉換的。)
