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완료 -
21-03-26
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2021.03.06 MySQL 테이블 생성 - 완료
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21.03.03
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감사합니다. 오류나던거 해결했네요.
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21.02.15 -
21.2.12
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2021.02.11
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20210209
create table topic(
-> id INT(11) NOT NULL AUTO_INCREMENT, 이름 데이터타입(길이) 공백X 자동으로 증가(중복x)
-> title VARCHAR(100) NOT NULL,
-> description TEXT NULL,
-> created DATETIME NOT NULL,
-> author VARCHAR(30) NULL,
-> profile VARCHAR(100) NULL,
-> PRIMARY KEY(id)); id를 중복X (고유값을 갖게 한다) -
ERROR 1064 (42000): You have an error in your SQL syntax; 관련하여
저도 같은 고생하다가 찾아 공유드립니다.
해결책 1) 작은따음표 표시를 다 생략하고 적는다.
해결책 2) 작은따음표(')를 다른것(`)으로 대체한다.
작은따음표가 두가지가 있습니다.
` : 숫자1옆, tab위 (물결과 같은 위치)<-정답
' : 엔터 옆,물음표 위 (쌍따음표와 같은 위치)<-오답
참고: 테이블명, 칼럼명, 프라이머리키안에 들어가는것 해결책1/2안중 하나로 모두 통일되어야함 -
2021.1.25 완료
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2021. 01. 22
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DB는 자료의 타입을 설정할 수 있다.
NULL - > 값이 없는 걸 허용한다.
PRIMARY KEY(id) - > 고유한 값의 컬럼을 지정, 중복을 허용하지 않는다. -
재접속 후 CREATE TABLE 진행할 때는 처음 알려주신 것과 같이 database(schema)를 설정해주고 하는 것이죠??
바로 실행 시 아래 에러가 발생하였고, 다시 database 설정(USE opentutorials) 후 진행 시 정상 실행 됐습니다!:)
오늘도 상세하고 친절한 강의 고맙습니다~이고잉님 덕분에 수월하게 따라가고 있어요!ㅎㅎ
[에러 메세지]
ERROR 1046 (3D000): No database selected
1. USE opentutorials 로 database 설정한 뒤 CREATE TABLE 다시 실행
2. 'topic' table이 이미 존재한다는 에러 메세지 확인 -> 테이블 이름 변경 후 실행(topic_2)
3. 에러 없음 확인 -
2021.01.08 완료!
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20 12 30 -
2020 12 29
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20.12.16 완료~!
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영상을 유심히보시면 띄어쓰기를 하십니다.. 저도 헤맸는데 같은간격으로 띄어야하는지는 모르겠지만 띄어쓰기를 하고나니 됩니다..
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12.13 -
계속 오류가 나는데... 도대체 왜 그런걸까요 ㅠㅠ
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-> id INT(11) NOT NULL AUTO_INCREMENT,
-> title VARCHAR(100) NOT NULL,
-' at line 2
이렇게 떠서 검색해서 찾아보는데도 잘 안 나오네요.. -
2020.12.09 데이터베이스에 표를 생성하는 구문 CREATE 학습
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2020.11.16
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20201017 완료
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CREATE TABLE opentutorials(
-> id INT(11) NOT NULL AUTO_INCREMENT,
-> title VARCHAR(100) NOT NULL,
-> description TEXT NULL,
-> created DATETIME NOT NULL,
-> profile VARCHAR(100) NULL,
-> PRIMARY KEY(id)
-> );
저도 계속 오류떠서 이렇게 해보니까 됐어요 ㅠㅠ..! -
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9/18 완료 -
완료 9.15일
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화이팅! -
2020.08.29.
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완료 2020.08.26 -
완료 -
Spread Sheet 와 SQL의 가장 큰 차이는 '규제'다!
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ㅇㄹ
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오늘은 여기까지
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완료!
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완료
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테이블 생성 완료.
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완료. 감사합니다~
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6.2 완료 -
MySQL 테이블의 생성
어떤 분야든 cheat sheet를 검색해보면 잘정리된 정보 검색 가능
데이터베이스는 컬럼↓의 데이터 타입을 강제할 수 있음
ex(ID 컬럼 : 1,2,3,4,5(숫자) / title 컬럼: MySQL,ORACLE(문자)
MySQL datatype number 확인
CREATE TABLE topic(
id INT(11) NOT NULL AUTO_INCREMENT, //c1 datatype(length) -> length: 얼마까지 노출시킬지 정함,
NOT NULL: 값이 없는 것을 허용안함, AUTO_INCREMENT: id 값 자동 +1(중복 방지)
title VARCHAR(100) NOT NULL, //VARCHAR 문자열 데이터타입 선언
description TEXT NULL, //TEXT 문자열 데이터타입 선언(본문이므로 많은 글자 수 필요) NULL: 값이 없는 것을 허용
created DATETIME NOT NULL, //DATETIME 날짜 데이터타입 선언
author VARCHAR(30) NULL,
profile VARCHAR(100) NULL,
PRIMARY KEY(id)); //topic 테이블의 id 컬럼이 메인키라는 것을 선언, PRIMARY KEY 1.성능적 측면
2.중복을 방지
데이터베이스 규제 정책 덕분에 원하는 형식으로 깔끔하게 유지하는데 큰 도움 -
05/29 고3 완료
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데이터베이스 도전
20.05.26일 / 완료 -
완료
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아무 오류 없이 완료돼어요 ㅎㅎㅎㅎ -
감사합니다 찜찜했는데 해결되었어요!!^^
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완료! -
20/4/24 학습 완료~ -
20.04.17 금 / 37세 비전공자 / 완료
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