잡은 물고기의 평균 길이 구하기

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**Committed Files:**
- [프로그래머스/1/293259. 잡은 물고기의 평균 길이 구하기/README.md](https://github.com/srlee056/algorithm-study/blob/main/프로그래머스/1/293259. 잡은 물고기의 평균 길이 구하기/README.md)
- [프로그래머스/1/293259. 잡은 물고기의 평균 길이 구하기/잡은 물고기의 평균 길이 구하기.sql](https://github.com/srlee056/algorithm-study/blob/main/프로그래머스/1/293259. 잡은 물고기의 평균 길이 구하기/잡은 물고기의 평균 길이 구하기.sql)