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ORDER BY RAND() 쓰는 이유 #260

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young-do opened this issue Dec 19, 2019 · 0 comments
Open

ORDER BY RAND() 쓰는 이유 #260

young-do opened this issue Dec 19, 2019 · 0 comments

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@young-do
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young-do commented Dec 19, 2019 •
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https://stackoverflow.com/questions/4329396/mysql-select-10-random-rows-from-600k-rows-fast
위 링크를 통해 ORDER BY RAND()를 대치할 수 있으나, 다음과 같은 이유로 대치하지 않는다.

  1. Query 문이 너무 길어진다. 이에 비해 ORDER BY RAND()는 매우 짧다.

  2. 여러 개를 가져오는 경우, 정렬되어 반환되므로 이를 다시 서버에서 섞어줘야 한다.

  3. 각 테이블의 행이 100개 미만이다.
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