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Class v1.0 </doc>

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MySQL은 오픈 소스 관계형 데이터베이스 관리 시스템(RDBMS)입니다.

MySQL은 다중 사용자, 다중 스레드 RDBMS로서, 데이터의 안정성과 보안성을 제공합니다. MySQL은 대부분의 운영 체제에서 작동하며, 웹 애플리케이션 개발, 데이터 분석, 빅 데이터, 클라우드 기반 애플리케이션 등에 많이 사용됩니다.

MySQL은 SQL(Structured Query Language)을 사용하여 데이터를 관리합니다. SQL은 데이터베이스에 저장된 데이터를 조작하기 위한 표준적인 언어로서, 데이터를 검색, 삽입, 업데이트, 삭제하는데 사용됩니다. MySQL은 이러한 SQL 문을 이용하여 데이터를 쿼리하고, 데이터의 무결성을 유지하며, 데이터베이스를 관리합니다.

MySQL은 사용이 간편하며, 대용량 데이터베이스를 처리할 수 있는 고성능 기능을 제공합니다. 또한, 오픈 소스로서, 다양한 개발자들이 지속적으로 개발 및 유지보수하고 있어, 사용자들이 다양한 문제들을 해결할 수 있는 방법을 제공합니다.

MySQL은 PHP 스크립트 언어와 상호 연동이 잘 되면서 오픈소스로 개발된 무료 프로그램입니다. 그래서 홈페이지나 쇼핑몰(워드프레스, Cafe24, 그누보드, 제로보드)등 일반적으로 웹 개발에 널리 사용하고 있습니다.

MySQL 설치

MAMP란 웹사이트를 개발할 떄 쓰이는 기술 스택인 macOS, Apache, MySQL, PHP의 약어이자 솔루션 스택이다. https://www.mamp.info/en/downloads/

php 정보 확인

phpinfo();
정보 파일 수정 위치 : Loaded Configuration File : C:\MAMP\conf\php8.0.1\php.ini
에러 표시 : display_errors = On (위에 php.ini 파일 안에 수정함)
에러 표시 : display_errors = On
캐시 설정 : opcache.enable = 0
PHP 관리자 페이지 : Window : http://localhost/phpMyAdmin/ MAC : http://localhost/phpMyAdmin5/

MySQL 실행

윈도우 : cd C:\MAMP\bin\mysql\bin
로그인 : mysql -uroot -proot
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.24 MySQL Community Server (GPL)

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
맥 : cd /Applications/MAMP/Library/bin 로그인 : ./mysql -uroot -proot
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.24 MySQL Community Server (GPL)

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement
show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
4 rows in set (0.01 sec)
create database 데이터베이스 이름;
create database sample01;
Query OK, 1 row affected (0.00 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sample01           |
| sys                |
+--------------------+
5 rows in set (0.00 sec)
use 데이터베이스 이름;
use sample01;
Database changed
drop database 데이터베이스 이름;
mysql> drop database sample01;
Query OK, 0 rows affected (0.02 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
4 rows in set (0.00 sec)
create table 테이블 이름;
create table members(
    memberID int(10) unsigned auto_increment,
    youEmail varchar(40) NOT NULL,
    youName varchar(10) NOT NULL,
    youPass varchar(20) NOT NULL,
    youBirth int(10) NOT NULL,
    youAge int(5) NOT NULL,
    regTime int(30) NOT NULL,
    PRIMARY KEY(memberID)
) charset=utf8;
create table reviews(
    reviewID int(10) unsigned auto_increment,
    memberID int(10) unsigned,
    youText tinytext NOT NULL,
    regTime int(30) NOT NULL,
    PRIMARY KEY(reviewID)
) charset=utf8;
show tables;
mysql> show tables;
+--------------------+
| Tables_in_sample01 |
+--------------------+
| member             |
+--------------------+
1 row in set (0.00 sec)
desc 테이블 이름
mysql> desc member;
+------------+------------------+------+-----+---------+----------------+
| Field      | Type             | Null | Key | Default | Extra          |
+------------+------------------+------+-----+---------+----------------+
| myMemberID | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| youEmail   | varchar(40)      | NO   |     | NULL    |                |
| youName    | varchar(20)      | NO   |     | NULL    |                |
| youPass    | varchar(20)      | NO   |     | NULL    |                |
| youBirth   | int(20)          | NO   |     | NULL    |                |
| youAge     | int(5)           | NO   |     | NULL    |                |
| regTime    | int(20)          | NO   |     | NULL    |                |
+------------+------------------+------+-----+---------+----------------+
7 rows in set (0.01 sec)
drop table 테이블 이름;
mysql> drop table member;
Query OK, 0 rows affected (0.01 sec)

mysql> show tables;
Empty set (0.00 sec)
RENAME TABLE 테이블 이름 TO 바뀔 테이블 이름;
mysql> show tables;
+----------------+
| Tables_in_mydb |
+----------------+
| members        |
| new_mytable    |
+----------------+
2 rows in set (0.00 sec)
truncat table 테이블 이름;
truncat table member;
Query OK, 0 rows affected (0.01 sec)


INSERT INTO 테이블명(필드명) VALUES

INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("webstoryboy@naver.com","황상연","1234","19990304","26","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("dlscks0930@naver.com","황인찬","1234","19980930","26","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("gp2617@naver.com","천설희","1234","19950313","29","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("dsy1943@naver.com","여다슬","1943","20011227","23","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("1346zany@gmail.com","이승연","1234","19991216","25","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("ebmdols@naver.com","장진용","1234","19940401","26","03140316");
INSERT INTO members(youEmail, youName, youpass, youBirth, youAge, regTime) VALUES("jo0132@naver.com","노지영","1234","19950323","29","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("skadldldl123@gmail.com","안교남","1234","19920923","32","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("ehcjswo1@gmail.com","김도현","123","19951003","29","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("goed0522@gmail.com","변우현","1234","20000629","24","03141516");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("yuna243441@naver.com","이유나","1234","20020508","22","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("im.kebab00@gmail.com","이요셉","1234","19990315","26","03140316");
INSERT INTO members(youEmail, youName, youpass, youBirth, youAge, regTime) VALUES("ture403@gmail.com","전윤기","1234","19920210","32","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("dongjin6539@naver.com","신동진","1234","19960709","28","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("gnsrbdi@naver.com","이훈규","1234","19950227","29","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("jeongyouna_@naver.com","정유나","1234","19950606","29","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("daanbi1345@gmail.com","조은경","1234","19930205","31","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("hunmi961119@gmail.com","진현미","1234","19961119","28","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("getgrovy@gmail.com","정희석","1234","19990101","26","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("kshkmn0929@naver.com","김도현","0929","20020929","22","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("hyejeong3283@gmail.com","이혜정","1234","19940622","30","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("didrn94553@gmail.com","이양구","1234","19941212","30","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("ghkddn132@naver.com","정황우","1234","19970130","25","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("esansi@naver.com","김현빈","1234","19970524","27","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("lee3ll@naver.com","이은지","1234","19930311","31","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("dripidea77@gmail.com","김시연","1234","19930313","31","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("itshena01@gmail.com","조한미","1234","19930211","31","03140316");
INSERT INTO members(youEmail, youName, youPass, youBirth, youAge, regTime) VALUES("aimee00418@gmail.com","권현정","1234","19830211","39","03140316");

INSERT INTO reviews(memberID, youText, regTime) VALUES("1", "고마워요", "1234");
INSERT INTO reviews(memberID, youText, regTime) VALUES("2", "몰라요", "1234");
INSERT INTO reviews(memberID, youText, regTime) VALUES("3", "뭐해요?", "1234");
INSERT INTO reviews(memberID, youText, regTime) VALUES("4", "댓글이요", "1234");
INSERT INTO reviews(memberID, youText, regTime) VALUES("6", "뭘까여?", "1234");
INSERT INTO reviews(memberID, youText, regTime) VALUES("7", "핸드폰 리뷰", "1234");
INSERT INTO reviews(memberID, youText, regTime) VALUES("8", "마우스 리뷰", "1234");
INSERT INTO reviews(memberID, youText, regTime) VALUES("9", "전체 데이터 불러오기 배우기", "1234");
INSERT INTO reviews(memberID, youText, regTime) VALUES("5", "데이터 불러오기를 배워요", "1234");
INSERT INTO reviews(memberID, youText, regTime) VALUES("10", "여름이네요", "1234");
 
SELECT 필드명 FROM 테이블이름 WHERE 조건

전체 데이터 불러오기

SELECT * FROM member
+----------+------------------------+---------+---------+----------+--------+---------+
| memberID | youEmail               | youName | youPass | youBirth | youAge | regTime |
+----------+------------------------+---------+---------+----------+--------+---------+
|        1 | skadldldl123@gmail.com | 안교남  | 1234    | 19920923 |     32 | 3140316 |
+----------+------------------------+---------+---------+----------+--------+---------+
1 row in set (0.00 sec)

memberID가 1번인 경우만 불러오기(회원가입한 사람들 불러오는거임 / 테이블 생성시 memberID값을 줬음.)

SELECT * FROM member WHERE memberID = 1;
SELECT * FROM member WHERE memberID = 1;
+----------+------------------------+---------+---------+----------+--------+---------+
| memberID | youEmail               | youName | youPass | youBirth | youAge | regTime |
+----------+------------------------+---------+---------+----------+--------+---------+
|        1 | skadldldl123@gmail.com | 안교남  | 1234    | 19920923 |     32 | 3140316 |
+----------+------------------------+---------+---------+----------+--------+---------+
1 row in set (0.00 sec)

memberID가 1번이 아닌 경우만 불러오기

SELECT * FROM member WHERE memberID <> 1;

memberID가 5번~10번 경우만 불러오기

SELECT * FROM member WHERE memberID >= 5 AND memberID <=10;

나이가 30인 사람만 불러오기

SELECT * FROM member WHERE youAge = 30;

나이가 30살 ~ 40살인 사람만 불러오기

SELECT * FROM member WHERE youAge BETWEEN 30 AND 40;

나이가 30살 ~ 40살이 아닌 사람만 불러오기

SELECT * FROM member WHERE youAge NOT BETWEEN 30 AND 40;

memberID가 1번, 5번, 10번, 15번만 불러오기

SELECT * FROM member WHERE memberID IN(1,5,10,15);

youName 중에 데이터가 없는 것 불러오기

SELECT * FROM members WHERE youName IS NULL;

youName 중에 데이터가 없는 것 반대 불러오기

SELECT * FROM members WHERE youName IS NOT NULL;

youName 중에 "연" 텍스트가 포함된 이름 불러오기

SELECT * FROM member WHERE youName like '%연%';

youName 중에 "김" 시작하는 이름 불러오기

SELECT * FROM member WHERE youName like '김%';

youName 중에 "현" 끝나는 이름 불러오기

SELECT * FROM member WHERE youName like '%현';

이름만 불러오기

SELECT youName FROM member;

이름만 불러오기(DESC : 내림차순)

SELECT * FROM member ORDER BY youName DESC;

이름만 불러오기(ASC : 오름차순)

SELECT * FROM member ORDER BY youName ASC;

이름, 나이만 불러오기

SELECT youName, youAge FROM member;

이름, 나이만 불러오고. 나이가 30이상만 불러오기

SELECT youName, youAge FROM member WHERE youAge >= 30;

youName 중에 "상"이 들어가는 이름 불러오기

SELECT * FROM member WHERE youName like '_상_';

youBirth 중에 3월달인 사람만 출력하기

SELECT youBirth FORM member WHERE youBirth like '____03__';

youName 중에 "김" 또는 "이" 시작하는 이름 불러오기

SELECT * FROM member WHERE youName like '김%' OR youName like '이%';

나이가 25살 이상이고 김씨 성을 갖고 있는 사람 불러오기

SELECT youName FROM member WHERE youAge >= 25 AND youName like '김__';

나이가 25살 이상이고 또는 김씨 성을 갖고 있는 사람 불러오기

SELECT youName FROM member WHERE youAge >= 25 OR youName like '김__';

나이가 25살 이상이고 또는 김씨 성을 갖고 있는 이름 불러오기

1) SELECT youName FROM member WHERE (memberID = 2 OR memberID = 9) AND youAge >= 25;
                               2) SELECT youName, youAge FROM member WHERE youAge >=25 AND memberID IN(2,9);

회원 데이터를 5개만 불러오기

SELECT * FROM member LIMIT 5;

회원 데이터를 5개만 불러오기(6~10)...[시작점, 갯수]

SELECT * FROM member LIMIT 5, 5;

회원 이메일을 기준으로 5개만 10개만 불러오기(11-20)

SELECT youEmail FROM member LIMIT 10, 10;

중복된 이름 제거

SELECT DISTINCT youAge FROM member;

특정 이메일을 사용하는 사람

SELECT * FROM member WHERE youEmail LIKE '%gmail%';

갯수 불러오기

SELECT count(youName) FROM member;
SELECT count(youPhone) FROM members;
SELECT count(youEmail) FROM members;;
SELECT count(*) FROM member;

패스워드가 1234인 사람 불러오기

SELECT youName FROM member WHERE youPass = 1234;

패스워드가 1234이고 나이가 30이상의 이름만 불러오기

SELECT youName FROM member WHERE youPass=1234 AND youAge >= 30;

비밀번호를 "1234567"로 변경하고 내림차순으로 10개만 변경하기

SELECT youName FROM member WHERE youPass=1234 AND youAge >= 30;
UPDATE 테이블이름 SET 컬러명 조건
UPDATE member SET youPass = "1234";
UPDATE member SET youPass="9999" WHERE memberID = 3;
UPDATE member SET youPass="1234567" ORDER BY youPass LIMIT 10;
UPDATE member SET youPass="9999" WHERE memberID = 3;
UPDATE member SET youAge="50" WHERE memberID BETWEEN 1 AND 10;
UPDATE member SET youPass="9999" ORDER BY youName DESC LIMIT 5;
DELETE FORM 테이블명 WHERE 조건

아이디가 5번인 멤버 삭제

DELETE FROM member WHERE memberID=5;

회원 비밀번호가 1234인 사람만 삭제하기

DELETE FROM member WHERE youPass="1234";

멤버를 기준으로 1번~5번째 멤버까지 삭제

DELETE FROM member ORDER BY memberID LIMIT 5;

멤버를 기준으로 원하는 멤버 삭제하기

DELETE FROM member WHERE memberID IN(11, 13, 15);
ALTER TABLE [테이블명] ADD [추가할 필드명] AFTER [필드위치]

멤버 테이블에 핸드폰 번호 필드를 추가

ALTER TABLE members ADD youPhone varchar(20) NOT NULL;

멤버 테이블에 핸드폰 번호 필드를 youAge 뒤에 추가

ALTER TABLE members ADD youPhone varchar(20) NOT NULL AFTER youAge;

멤버 테이블에 특정 필드 수정하기 뒤에 추가

ALTER TABLE members MODIFY youPhone int(20) NOT NULL;
ALTER TABLE [테이블명] MODIFY [수정할 필드명]
ALTER TABLE members MODIFY youPhone varchar(20); (TYPE,타입 변경)

mysql> ALTER TABLE new_mytable MODIFY youPhone varchar(10);
ALTER TABLE [테이블명] DROP [삭제할 필드명]
ALTER TABLE members DROP youPhone;
SELECT [필드명] FROM [테이블명][앨리어스] JOIN [연결할 테이블명 앨리어스] ON [기준이 되는 조건문]

trancate table 테이블 이름 (데이터 초기화)

TRUNCATE members;

멤버 테이블에 핸드폰 번호 필드를 추가

ALTER TABLE members ADD youPhone varch(20) NOT NULL;
SELECT [필드명] FROM [테이블명 앨리어스] JOIN [연결할 테이블명 앨리어스] ON [기준이 되는 조건문]

멤버 테이블과 리뷰 테이블 중에 원하는 조건을 가져옴

SELECT m.youEmail, m.youName, r.youText, r.regTime FROM members m JOIN reviews r ON (m.memberID = r.memberID);

2개의 테이블을 합치고 필드명 바꾸기(변경하기)

SELECT m.youEmail, m.youName, r.youText, r.regTime AS reviewRegTime FROM members m JOIN reviews r ON (m.memberID=r.memberID);

2개의 테이블을 합치고 필드명 바꾸기

SELECT m.youEmail, m.youName, r.youText, r.regTime AS reviewRegTime FROM members m JOIN reviews r ON (m.memberID=r.memberID);

두개의 테이블(members, review) 합치기 : 왼쪽 테이블 기준(안쓴거와 쓴거 2개의 테이블 합쳐서 나옴)

SELECT m.youEmail, m.youName, r.youText, r.regTime FROM members m LEFT JOIN reviews r ON (m.memberID = r.memberID);

                        CREATE TABLE schoolRecode (
                            studentID int(10) unsigned NOT NULL AUTO_INCREMENT comment "학생번호",
                            class tinytext comment "소속클래스(반)",
                            english tinytext NOT NULL comment "영어점수",
                            math tinytext NOT NULL comment "수학점수",
                            science tinytext NOT NULL comment "과학점수",
                            coding tinytext NOT NULL comment "코딩점수",
                            PRIMARY KEY(studentID)
                        ) charset=utf8;
                        INSERT INTO schoolRecode(english, math, science, coding) VALUES(50, 10, 20, 100);
                        INSERT INTO schoolRecode(class, english, math, science, coding) VALUES(1, 50, 10, 20, 100);
                        INSERT INTO schoolRecode(class, english, math, science, coding) VALUES(2, 40, 30, 22, 90);
                        INSERT INTO schoolRecode(class, english, math, science, coding) VALUES(2, 50, 40, 23, 80);
                        INSERT INTO schoolRecode(class, english, math, science, coding) VALUES(3, 60, 50, 24, 70);
                        INSERT INTO schoolRecode(class, english, math, science, coding) VALUES(4, 70, 60, 25, 60);
                        INSERT INTO schoolRecode(class, english, math, science, coding) VALUES(5, 80, 70, 26, 50);
                    

레코드 갯수 구하기

SELECT count(class) FROM schoolRecode;

레코드 갯수 구하기(null값 포함)

SELECT count(*) FROM schoolRecode;

레코드 합계 구하기

SELECT sum(coding) FROM schoolRecode;

코딩 합계 구하기 (학생 아이디가 1~4)

SELECT sum(coding) FROM schoolRecode WHERE studentID >= 1 AND studentID <= 4;

가장 높은 코딩 점수 구하기

FROM schoolRecode WHERE studentID >= 1 AND studentID <=4;< /div>

가장 낮은 코딩 점수 구하기

SELECT max(coding) FROM schoolRecode;

가장 낮은 코딩 점수 구하기

SELECT min(coding) FROM schoolRecode;

코딩 평균 점수 구하기

SELECT avg(coding) FROM schoolRecode;

그룹별 집계

SELECT [필드명] FROM [테이블명] GROUP BY [필드명]

반별로 학생들의 영어 점수 평균값 구하기

SELECT class, avg(english) FROM schoolRecode WHERE class IN(1,2,3,4,5) GROUP BY class;

반별로 학생들의 수학 점수 합계 구하기

SELECT class, sum(math) FROM schoolRecode WHERE class IN(1,2,3,4,5) GROUP BY class;

반별로 학생들의 수학 점수 합계 점수가 70점 이상

SELECT class, sum(math) FROM schoolRecode WHERE class IN(1,2,3,4,5) GROUP BY class HAVING sum(math) >= 70;

출력 결과의 정렬

SELECT [필드명] FROM [테이블명] ORDER BY [필드명] DESC 또는 ASC

영어 점수를 높은 순에서 낮은 순으로 표시

SELECT studentID, english FROM schoolRecode ORDER BY english DESC;

영어 점수를 낮은 순에서 높은 순으로 표시

SELECT studentID, english FROM schoolRecode ORDER BY english ASC;

반별 수학 점수를 높은 순에서 낮은 순으로 표시

SELECT class, sum(math) FROM schoolRecode WHERE class IN(1,2,3,4,5) GROUP BY class ORDER BY sum(math) DESC;