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서브쿼리

현재 뽑아올려는 데이터가 테이블 과 컬럼에는 없는데 , 가상의 테이블을 만들어서 뽑아오고 싶을때select 절에 사용하는 scalar subquery한개의 로우만 반환한다.일치하는 값이 없을 경우 NULL 값 return 불 필요한 조인을 하지 않기 위해서 많이 사용한

2022년 2월 12일
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