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Oracle Database 23ai SQL Associate Sample Questions:

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

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

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

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

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

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

4. What is the result of the following query?
SELECT employee_id
FROM employees
WHERE EXISTS (SELECT 1 FROM departments WHERE department_id = 10);

A) Employees with salaries greater than 10
B) All employee IDs
C) Employee IDs from department 10
D) Employee IDs from departments with no employees

5. Which clause in an UPDATE statement typically uses a subquery to assign values to columns?

A) HAVING
B) WHERE
C) FROM
D) SET

Solutions: