how to find max and min salary in sql

1SELECT MAX(salary), MIN(salary) FROM employees;

1SELECT MAX(SALARY) FROM EMPLOYEES
2UNION
3SELECT MIN(SALARY) FROM EMPLOYEES;

1SELECT FIRST_NAME , SALARY
2FROM EMPLOYEES
3WHERE SALARY IN (SELECT MAX(SALARY)AS RESULT FROM EMPLOYEES
4UNION
5SELECT MIN(SALARY)AS RESULT FROM EMPLOYEES);