Structured Query Language tutorial - 01_CR

in #mysql6 years ago (edited)

Structured Query Language tutorial - CR


해당 스터디 내용은 다음의 링크에서도 확인하실 수 있습니다.

** CREATE == INSERT

mysql row를 어떻게 만들지?
스크린샷 2018-08-22 오후 1.37.56.png

테이블 작성을 어떻게 했더라??

DESC 테이블이름;  
DESC topic;

스크린샷 2018-08-22 오후 1.38.03.png

** READ == SELECT

SELECT * FROM 테이블이름;  
SELECT * FROM topic;
 # 전부 보고 싶으면? =>   * 로  모든 컬럼 선택

스크린샷 2018-08-22 오후 1.38.13.png

일부만 보고 싶으면?

SELECT 보고싶은 컬럼이름 FROM 테이블이름;
SELECT id,title,description FROM topic;

스크린샷 2018-08-22 오후 1.29.31.png

원하는 것만 선택해서 보자. WHERE문

SELECT 보고싶은 컬럼이름 FROM 테이블이름 WHERE 컬럼='값';
SELECT id,title,description FROM topic WHERE author='Jaeuk-YOO';

스크린샷 2018-08-22 오후 1.38.30.png

근데 양이 오지게 많으면 문제가 좀 생기겠죠?
스크린샷 2018-08-22 오후 1.46.29.png

그래서 나오는 수에 대해 제한을 건다 이말이야.

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