문제to_date가 1998년도인 연봉 상위 10% 사원의 정보 조회WITH salary_ranked AS ( SELECT a.emp_no, a.first_name, a.last_name, b.salary, percent_rank() OVER (ORDER BY b.salary DESC) AS percentile FROM employees AS a JOIN ( SELECT emp_no, salary FROM salaries WHERE YEAR(to_date) = 1998 -- 연도 필터링 ..