해커랭크 weather observation station 3
![[Hackerrank SQL] Weather Observation Station 3](https://img1.daumcdn.net/thumb/R750x0/?scode=mtistory2&fname=https%3A%2F%2Fblog.kakaocdn.net%2Fdn%2Fbi39al%2FbtqXY03ifT2%2FeQFaRlCDK4aBElBFWdHIzK%2Fimg.png)
[Hackerrank SQL] Weather Observation Station 3
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