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Oracle Database 23ai SQL Associate Sample Questions:

1. What happens when the TRUNCATE TABLE statement is executed?

A) Deletes only the last row in the table
B) Deletes all rows in the table without logging the operation for rollback
C) Deletes the table structure permanently
D) Deletes all rows in the table and logs the operation for rollback

2. Which of the following data dictionary views provides information about constraints on tables?

A) DBA_CONSTRAINTS
B) ALL_CONSTRAINTS
C) All of the above
D) USER_CONSTRAINTS

3. What is the difference between UNION and UNION ALL?

A) UNION combines columns, while UNION ALL combines rows.
B) UNION works with subqueries, while UNION ALL does not.
C) UNION removes duplicates, while UNION ALL includes all rows, including duplicates.
D) UNION includes all rows, while UNION ALL removes duplicates.

4. What will the following query return?
SELECT EXTRACT(YEAR FROM CURRENT_DATE) AS year FROM dual;

A) The current year in the database time zone
B) An error due to incorrect syntax
C) The full date in the session time zone

5. What is the purpose of using external tables in Oracle Database?

A) To improve the performance of complex queries
B) To store backup copies of database tables
C) To manage data stored in external files using SQL
D) To create temporary tables for session-specific data

Solutions: