August 2022
Beginner to intermediate
436 pages
9h 43m
Korean
Content preview from SQL로 시작하는 데이터 분석
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312
SQL로 시작하는 데이터 분석
SELECT
percentile_cont
(0.25)
within
group
(
order
by
mag)
as
pct_25
,
percentile_cont
(0.5)
within
group
(
order
by
mag)
as
pct_50
,
percentile_cont
(0.75)
within
group
(
order
by
mag)
as
pct_75
FROM
earthquakes
WHERE
mag
is
not
null
and
place = ‘Central Alaska’
;
pct_25 pct_50 pct_75
------ ------ ------
0.8 1.1 1.4
위 쿼리는 지정된 백분위수에 해당하는 지진 규모를 반환하므로, 이를 통해 전체 데이터셋의
대략적인 분포를 확인할 수 있습니다.
25
번째,
50
번째,
75
번째 백분위수에 해당하는 값은 앞
서 확인한
4
분위수의
1
,
2
,
3
에 해당하는 값과 일치합니다. 다른 필드의 백분위수를 확인하려
면
ORDER
BY
절에서 필드 이름만 변경하면 됩니다.
SELECT
percentile_cont
(0.25)
within
group
(
order
by
mag)
as
pct_25_mag
,
percentile_cont
(0.25)
within
group
(
order
by
depth
)
as
pct_25_depth ...
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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.