26. Employee Bonus
https://leetcode.com/problems/employee-bonus/
Write a solution to report the name and bonus amount of each employee with a bonus less than 1000.
select name, bonus from employee e left join bonus b on e.empId=b.empId where bonus is null or bonus < 1000
Left join을 통해 null값과 1000미만을 찾아서 추출하기!