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#Index-Purpose #6

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bshclosegrip opened this issue Apr 5, 2021 · 0 comments

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bshclosegrip commented Apr 5, 2021

#INDEX

목적 : 검색을 보다 빠르게 하기 위해
primary key, unique 속성 갖는 컬럼에는 자동으로 index 처리됨

##index 사용 조건

테이블에 행수가 많을 경우
where 절 많이 사용되는 컬럼
join에 자주 사용 컬럼
null포함 컴럼 많은 경우

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