【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 本文为(CUUG 原创)整理并解析,转发请注明出处,禁止抄袭及未经注明出处的转载。 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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