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Oracle Database 23ai SQL Associate Sample Questions:

1. What will the following query do?
SELECT employee_id, salary
FROM employees
WHERE salary > (SELECT AVG(salary) FROM employees);

A) Return employees with a salary below the average salary
B) Return all employees and their salaries
C) Return employees with a salary equal to the average salary
D) Return employees with a salary above the average salary

2. Which clause is used to allow a user to grant a privilege to others?

A) WITH SELECT OPTION
B) WITH ADMIN OPTION
C) WITH GRANT OPTION
D) WITH SHARE OPTION

3. Which type of join retrieves only the rows with matching values in both tables?

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

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 departments with no employees
D) Employee IDs from department 10

5. What is the primary purpose of an index in SQL?

A) To improve the performance of data retrieval queries
B) To ensure uniqueness of values in a column
C) To store metadata about a table
D) To enforce data integrity constraints

Solutions: