[SQLite3로 가볍게 배우는 데이터베이스:SQL 기초 실습] 따라하기 A16

 [ 출처 : wikidocs "SQLite3로 가볍게 배우는 데이터베이스:SQL 기초 실습" - A16 ]



■ UNION ALL 과 UNION


- 복수의 질의문을 하나로 합친 결과를 얻을 수 있음

- 테이블의 구조가 같으면 합칠 수 있음


1. UNION ALL


- 다음의 query도 같은 결과를 리턴



2. UNION


- 중복 데이터를 제외한 결과를 정렬하여(오름차순) 리턴



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