display all the information for all employees who have the letters D or S in their first name and also arrange the result in descending order by salary.
SELECT * FROM employees WHERE first_name LIKE '%D%' OR first_name LIKE '%S%' ORDER BY salary DESC
letters D or S in their first name refers to first_name LIKE '%D%' OR first_name LIKE '%S%'; arrange in descending order by salary refers to ORDER BY salary DESC; display all information refers to SELECT *;