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Oracle Database 23ai SQL Associate Sample Questions:

1. What does the UNION ALL operation do when selecting matching columns from different tables?
SELECT employee_id, salary FROM employees
UNION ALL
SELECT employee_id, bonus FROM bonuses;

A) Combines the salaries and bonuses for employees, removing duplicates
B) Returns only employees with duplicate employee IDs in both tables
C) Combines all employee IDs, salaries, and bonuses, including duplicates
D) Returns only the employees with salaries and bonuses

2. Which SQL keyword is used to remove duplicate rows from the result set of a query?

A) UNIQUE
B) DISTINCTROW
C) DISTINCT
D) ONLY

3. What does the following query return?
SELECT department_id FROM departments
INTERSECT
SELECT department_id FROM employees;

A) All department IDs from the employees table
B) Department IDs that exist in both the departments and employees tables
C) Department IDs that exist only in the employees table
D) All department IDs from the departments table

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

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

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

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

Solutions: