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Oracle Database 23ai SQL Associate Sample Questions:

1. What does a Cartesian product in SQL result from?

A) An INNER JOIN without specifying join conditions
B) An OUTER JOIN with NULL values
C) A NATURAL JOIN without specifying join conditions

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

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

3. Which command revokes a user's privilege to update a table?

A) DENY UPDATE ON table_name FROM user_name;
B) DELETE UPDATE ON table_name FROM user_name;
C) REVOKE UPDATE ON table_name FROM user_name;
D) REMOVE UPDATE ON table_name FROM user_name;

4. What is the result of the following SQL query?
SELECT COALESCE(NULL, 100, 200) AS result FROM dual;

A) 100
B) 200
C) NULL
D) 300

5. What does the following SQL statement do?
SELECT e.employee_id, d.department_name
FROM employees e
JOIN departments d ON e.department_id = d.department_id;

A) Retrieves employees and departments with matching department_id
B) Retrieves all employees and their departments
C) Retrieves only departments with no employees
D) Retrieves only employees without departments

Solutions: