【优技教育】Oracle 19c OCP 082题库(第6题)- 2024年修正版
考试科目:1Z0-082
考试题量:90
通过分数:60%
考试时间:150min
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原文地址:http://www.cuug.com/index.php?s=/home/article/detail/id/3388.html
第6题:
6、Choose two.
Which two are true about the precedence of operators and conditions?
A) || has a higher order of precedence than + (addition).
B) Operators are evaluated before conditions.
C) AND and OR have the same order of precedence in a condition.
D) NOT has a higher order of precedence than AND and OR in a condition.
E) + (addition) has a higher order of precedence than * (multiplication).
Answer:BD
(解析:本体考的是逻辑操作符的优先级以及并置连接符与运算操作符之间的优先级问题,考题比较有新意。利用排除法得出答案 BD,答案 D 比较容易理解。并置连接符只是单纯的对数据进行连接,没有优先级之分)
B:在条件之前对运算符进行评估
以下例子说明答案 A 是错的。
SQL> select 3 - 9||2 + 5||2 from dual;
3-9||2+5
--------
-572
SQL> select 9 - 3||2 + 5||2 from dual;
9-3||2
------
672
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