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https://kwanghyung.tistory.com/entry/Oracle-Database-%ED%98%95%EB%B3%80%ED%99%98-%ED%95%A8%EC%88%98 Oracle Database -형변환 함수 https://kwanghyung.tistory.com/entry/Oracle-Database-%EC%88%AB%EC%9E%90%EC%99%80-%EB%82%A0%EC%A7%9C-%ED%95%A8%EC%88%98 Oracle Database - 숫자와 날짜 함수 https://kwanghyung.tistory.com/entry/Oracle-.. kwanghyung.tistory.com 집계함수 : 데이터들의 합 (SUM), 평균 (AVG), 수(COUNT),최대(MAX),최소(MIN),..