May 2022
Beginner to intermediate
448 pages
13h 7m
Korean
book
밑바닥부터 시작하는 데이터 과학 데이터 분석을 위한 파이썬 프로그래밍과 수학·통계 기초
by Joel Grus, Hangyeol Kim, Seongju Ha, Eunjung Park
Content preview from 밑바닥부터 시작하는 데이터 과학 데이터 분석을 위한 파이썬 프로그래밍과 수학·통계 기초
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from Scratch
381
new
_
table.rows.sort(key=order)
return new
_
table
이 메서드는 다음과 같이 사용할 수 있다.
friendliest
_
letters = (
avg
_
friends
_
by
_
letter
.order
_
by(lambda row: -row["avg
_
num
_
friends"])
.limit(4)
)
SQL
의
ORDER BY
는 오름차순(
ASC
)과 내림차순(
DESC
) 여부를 옵션으로 전달할 수
있다. 이는 우리의
order
함수에 추가해야 할 것이다.
24.7
JOIN
관계형 데이터베이스는 종종 중복을 최소화하도록 정규화(
normalize
)되어 있
다. 예를 들어 파이썬으로 사용자 관심사를 다룰 때는 단순히 각 사용자에 대해
관심사를 리스트로 표현하면 됐었다.
SQL
테이블은 보통 리스트를 담고 있지 않으므로 보통의 해결책은 새로운 테
이블인
user_interests
를 생성해서
user_id
와 관심사
interest
사이에
1
:
N
관계
를 성립하게 하는 것이다. 이를
SQL
로 표현하면 다음과 같다.
CREATE TABLE user
_
interests (
user
_
id INT NOT NULL,
interest VARCHAR(100) NOT NULL
);
NotQuiteABase
에서는 다음과 같이 테이블을 생성할 ...
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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.