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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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
Oracle 19c OCP认证需要到Oracle指定的WDP机构，有了培训记录之后才能考试，考试需要考2科，分别是082(60%及格)和083(57%及格)，两科都通过之后才能拿到证书。证书如下：
