August 2022
Beginner to intermediate
436 pages
9h 43m
Korean
Content preview from SQL로 시작하는 데이터 분석
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153
3
장
시계열 분석
귀금속업
매출(백만)
서점업
매출(백만)
식료품업
매출(백만)
월
그림
3-16
귀금속업, 서점업, 식료품업 매출의 계절성 패턴 예시
계절성은 여러 패턴으로 나타나지만, 이와 상관없이 분석에 주로 사용되는 방법이 있습니다.
한 가지는 데이터를 더 작은 단위의 시간 구간으로 집계하거나, 앞 절에서 배운 시간 윈도우 롤
링을 사용하는 방법입니다. 혹은 현재 시간 구간과 이전 시간 구간의 차이를 비교하는 방법도
있습니다. 이어서 예제를 살펴보며 두 가지 방법을 사용해봅시다.
3.5.1
구간 비교:
YoY
과
MoM
구간 비교
period
-
over
-
period
는 여러 형태가 있는데, 주로 현재 시간 구간의 값을 이전 시간 구
간의 값과 비교하는 방법이 많이 사용됩니다. 비교하려는 집계 단위에 따라 전년 대비 증감
률
year
-
over
-
year
(
YoY
), 전월 대비 증감률
month
-
over
-
month
(
MoM
), 전일 대비 증감률
day
-
over
-
day
(
DoD
) 등이 있습니다.
154
SQL로 시작하는 데이터 분석
윈도우 함수
lag
를 사용해 계산해봅시다.
lag
함수는 데이터에서 이전
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.