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9/18 완료
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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 -
완료했습니다~~!!! 200416
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20/4/14 학습 완료
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감사합니다!
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감사합니다..
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03/24/20 학습완료!
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CREATE TABLE `opentutorials`.`new_table` (
`id` INT NOT NULL AUTO_INCREMENT,
`title` VARCHAR(100) NOT NULL,
`description` TEXT NULL,
`subsmission` DATETIME NOT NULL,
`author` VARCHAR(30) NULL,
`profile` VARCHAR(100) NULL,
PRIMARY KEY (`id`)
);
전 이렇게 했더니 수많은 오류 끝에 됬어요 -
감사합니다.
-
감사합니다^^
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완료! 감사합니다
-
Query OK, 0 rows affected, 1 warning (0.02 sec) 관련 에러가 뜨시는 분들에게 도움이 되었으면 합니다.
일단, 에러가 뜨는 이유는 현재 업로드 된 강의와 실습을 하시는 분들의 mysql 버전이 달라서 에러가 나는 것 같습니다.
검색결과, mysql 8.0.17 버전부터는 int 데이터 타입의 width를 설정하는 것을 더 이상 지원하지 않고, 향후 버전부터 제거 될 기능 중 하나라고 합니다.
실습을 하시는 도중이시거나 완료하신 후에 조금 찜찜하시다면,
ALTER TABLE 테이블명 MODIFY COLUMN 컬럼명 데이터타입 조건;
( 강의에서 보셨던 것들을 그대로 입력하셨다면, ALTER TABLE topic MODIFY COLUMN id int NOT NULL AUTO_INCREMENT; )
을 입력하시면 에러가 없어지신 것을 확인하실 수 있으실 겁니다.
추가적으로 명령어 작성 후, warning이 발견되면, show warnings \g 명령어를 입력하신 다음, 나오는 코드번호와 메시지를 구글링하셔서 찾아보시는 것도 도움이 되실거라고 생각합니다. -
질문입니다.
Query OK, 0 rows affected, 1 warning (0.02 sec)
이렇게 뜨면 오류인가요 정상적으로 된것인가요? -
warn이 하나 뜨는데 일단 쿼리 ok는 됐어요..
warn메시지는 어떻게 보나요?ㅠㅠ 그리고 위쪽 화살표나오면 전체가 다시 안뜨고 한줄씩 뜨는데 다시 쳐야하는건가요 -
저도 궁금해서 소문자로 해봤는데 소문자도 문제없이 잘 돼요^^
-
질문 입니다.
강의를 듣고 그대로 따라 하다보니까요
명령어들이 대문자로 되어있네요
꼭 대문자 이어야 하나요??
아니면 소문자도 되나요??
어떤 법칙(원칙)이 있나요??
어뚱한 질문일지는 몰라도
이제 입문(왕초보)이다 보니~~~ -
강의 감사합니다.^^
정말로 듣고 싶었던 강의 입니다.
고맙습니다. -
20191126
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완료 191120
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완료 191120
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CREATE TABLE topic (
id INT(11) NOT NULL AUTO_INCREMENT,
title VARCHAR(100) NOT NULL,
description TEXT,
created DATETIME NOT NULL,
author VARCHAR(30),
profile VARCHAR(100),
PRIMARY KEY(id));
AUTO_INCREMENT = CELL이 1씩 증가되며 초기값을 정할수있다.
PRIMARY KEY(id) = 해당LINE의 대표가되는 CELL을 정하는 명령어 -
도움많이되요^^
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다시 보기! 재밌어요! -
완료!
-
완료^^ -
20191007 Ted 완료!
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완료
-
CREATE TABLE topic(
id INT(11) NOT NULL AUTO_INCREMENT,
title VARCHAR(100) NOT NULL,
description TEXT NULL,
created DATETIME NOT NULL,
author VARCHAR(30) NULL,
profile VARCHAR(100) NULL,
PRIMARY KEY(id)
);
버전 관리
| egoing |
| 현재 버전 | |
|---|---|
| 선택 버전 |
