Oracle 1z0-082 Exam Practice Questions (P. 3)

GPT-4o - Answer

The SET VERIFY ON command in SQL*Plus is useful as it enables the display of values for substitution variables that you actually utilize in your SQL commands. Keep in mind that if you define a variable and don't use it right after in your SQL statement, it won't be shown by SET VERIFY ON. This feature makes tracing and debugging much easier by allowing you to confirm the values being passed into your queries, ensuring they run as expected.

GPT-4o - Answer

While it is clear that a self-join necessitates different aliases for identification (B), it's important to understand the flexibility in its structure. An ON clause can indeed be used for specifying conditions (E), however, it isn't the only way as WHERE could also be a fit. What's essential to address is the misconception about self-joins being strictly inner joins. While they often are used as such for equijoins, they can definitely be structured as outer joins, addressing various relational scenarios (F). This ability to function as an outer join expands the practical applications of self-joins beyond limiting contexts.

GPT-4o - Answer

B is indeed the correct selection here. When you use a single ampersand (&), Oracle SQL will prompt you to input values every time you run the query. Conversely, double ampersands (&&) will remember the value after the first input, so they won't prompt you again during the session. For the scenario where you need to prompt the column names and conditions each time but only prompt for the table name once, option B perfectly aligns because it uses single ampersands for columns and condition and a double ampersand for the table name. Great choice for dynamic querying without repetitive prompts!