【优技教育】Oracle 19c OCP 082题库(Q 3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/3386.html
第3题:
3、Choose two.
Which is true about the & and && prefixes with substitution variables?
A) Both & and && can prefix a substitution variable name in queries and DML statements.
B) The && prefix will not prompt for a value even if the substitution variable is not previously defined in the session.
C) An && prefix to an undefined substitution variable, which is referenced multiple times in multiple queries, will prompt for a value once per query.
D) & can prefix a substitution variable name only in queries.
E) An & prefix to an undefined substitution variable, which is referenced twice in the same query,will prompt for a value twice.
Answer:AE
(解析:此题的难点在对英文的理解上,答案 C 错误的地方是多次查询,一个是相同的查询里面引用多次,每次查询都要提示一次输入,实际上不需要的。)
A: &和&&都可以在查询和 DML 语句中作为替换变量名的前缀
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