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Oracle Database 23ai SQL Associate Sample Questions:

1. Which SET operator returns rows from the first query that are not present in the second query?

A) UNION
B) INTERSECT
C) UNION ALL
D) MINUS

2. What type of join does the following query perform?
SELECT *
FROM employees e, departments d
WHERE e.department_id = d.department_id;

A) CROSS JOIN
B) NATURAL JOIN
C) OUTER JOIN
D) EQUI JOIN

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

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

4. What will the following SQL query return?
SELECT TRUNC(15.678, 2) AS truncated_value FROM dual;

A) 15.6
B) 15.67
C) 15.68
D) 15.678

5. Which statement can be used to undo changes made in a transaction?

A) MERGE
B) ROLLBACK
C) COMMIT
D) SAVEPOINT

Solutions: