Final answer:
The correct SELECT statement is option C, which selects the required columns from the employees and sales_dept tables, matches the employee IDs, filters based on sales and bonus requirements, and orders the results in descending order of sales.
Step-by-step explanation:
The correct SELECT statement to accomplish this task is option C:
SELECT e.employee_id, e.last_name, e.first_name, s.sales
FROM employees e, sales_dept s
WHERE e.employee_id = s.employee_id AND sales > 50000 AND bonus IS NOT NULL
ORDER BY sales DESC;
This query selects the required columns from the employees and sales_dept tables, matches the employee IDs, filters based on sales and bonus requirements, and orders the results in descending order of sales.