【優技教育】Oracle 19c OCP 082題庫(Q 5題)- 2024年修正版
考試科目:1Z0-082
考試題量:90
通過分數:60%
考試時間:150min
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原文地址:http://www.cuug.com/index.php?s=/home/article/detail/id/3387.html
第5題:
5、Choose two.
Which two are true about queries using set operators such as UNION?
A) An expression in the first SELECT list must have a column alias for the expression.
B) In a query containing multiple set operators, INTERSECT always takes precedence over UNION and UNION ALL.
C) Queries using set operators do not perform implicit conversion across data type groups (e.g. character, numeric).
D) CHAR columns of different lengths used with a set operator return a VARCHAR2 whose length equals the longest CHAR value.
E) All set operators are valid on columns of all data types.
Answer:CD
(解析:有關 set operator 的考點很多,經過實驗 C 答案是對的,不會進行隱式轉換;當列的長度不一樣時,以最長的為準,都能夠顯示內容。)
Oracle 19c OCP認證需要到Oracle指定的WDP機構,有了培訓記錄之后才能考試,考試需要考2科,分別是082(60%及格)和083(57%及格),兩科都通過之后才能拿到證書。證書如下:
CUUG是甲骨文的金牌WDP合作機構,30多年品牌,培養了數萬名數據庫人才。想快速通過19c OCP考試的同學可以掃碼聯系老師咨詢。