1. [순위 검색](https://school.programmers.co.kr/learn/courses/30/lessons/72412?language=java) 2. [메뉴 리뉴얼](https://school.programmers.co.kr/learn/courses/30/lessons/72411?language=java) 3. [수식 최대화](https://school.programmers.co.kr/learn/courses/30/lessons/67257?language=java) 4. [후보키](https://school.programmers.co.kr/learn/courses/30/lessons/42890?language=java) 5. [튜플](https://school.programmers.co.kr/learn/courses/30/lessons/64065?language=java)
