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hackerrank Weather Observation Station 3

1) MOD(id, 2) = 0 1-1) SELECT city FROM STATION WHERE MOD(id, 2) = 0; 1-1) 결과 2) 중복 체크 2-1) SELECT city FROM STATION WHERE MOD(id, 2) = 0 GROUP BY city; 2-1) 결과 SUCCESS!!
HackerRank/SQL 2021. 1. 30. 23:38
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