/*Write a query to display the employee id, name ( first name and last name ), salary and the SalaryStatus column with a title
 HIGH and LOW respectively for those employees whose salary is more than and less than the average salary of all employees.

*/

    SELECT  employee_id,  first_name, last_name, salary,    
    CASE WHEN salary >=   
    (SELECT AVG(salary)   
    FROM employees) THEN 'HIGH'    
    ELSE 'LOW'    
    END AS SalaryStatus   
    FROM employees;