August 2022
Beginner to intermediate
436 pages
9h 43m
Korean
Content preview from SQL로 시작하는 데이터 분석
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43
2
장
데이터 준비
표
2-1
일반 데이터베이스 데이터 타입 개요
타입 이름 설명
문자열
CHAR
/
VARCHAR
문자열 데이터를 저장합니다.
VARCHAR
는 지정된 범위(예: 최대
256
자) 내에서 가변 길이 값을 저장하며
CHAR
는 항상 고정 길이 값을 저장
합니다.
TEXT
/
BLOB
VARCHAR
의 범위를 넘어서는 긴 문자열 데이터를 저장합니다. 설문 응
답 등의 텍스트를 저장합니다.
숫자
INT
/
SMALLINT
/
BIGINT
정수 데이터를 저장합니다. 어떤 데이터베이스는
SMALLINT
,
BIGINT
타입을 지원하기도 합니다.
FLOAT
/
DOUBLE
/
DECIMAL
실수 데이터를 저장하며 정수부와 소수부의 길이를 직접 지정하기도
합니다.
논리
BOOLEAN TRUE
와
FALSE
값을 저장합니다.
날짜/시간
DATETIME
/
TIMESTAMP
날짜 및 시간 데이터를 저장합니다. 주로
YYYY
-
MM
-
DD
hh
:
mi
:
ss
형
태이며
YYYY
는 네 자릿수 연도,
MM
은 두 자릿수 월,
DD
는 두 자릿수 일
을 의미하고,
hh
는 두 자릿수 시간(
24
시간 기준으로
0
과
23
사이),
mi
는 두 자릿수 분,
ss
는 두 자릿수 초를 의미합니다. 어떤 데이터베이스
는 표준 시간대 표기 없이
TIMESTAMP
값만 저장하기도 합니다.
TIME
시간 데이터를 저장합니다.
문자열은 ...
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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.