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Oracle Database 23ai SQL Associate Sample Questions:

1. What will the following query result in?
SELECT e.employee_id, e.manager_id
FROM employees e
WHERE e.manager_id IS NOT NULL;

A) All employees and their IDs
B) Employees and their managers' IDs
C) Employees who have managers
D) Employees who do not have managers

2. What does the COMMIT statement do in SQL?

A) Rolls back changes to a previous state
B) Discards all pending changes in the transaction
C) Saves all pending changes to the database permanently
D) Begins a new transaction

3. Which of the following ensures that a relational database enforces data integrity?

A) Redundant data storage
B) Constraints such as primary keys, foreign keys, and unique constraints
C) Hierarchical data organization
D) Indexes on all columns

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

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

5. Which data dictionary view provides information about all tables accessible to the current user?

A) ALL_TABLES
B) DBA_TABLES
C) SESSION_TABLES
D) USER_TABLES

Solutions: