Skip to main content

Class v1.0 </doc>

getgrovy_blog

MySQL

Mysql :D

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 PHP스크립트 언어와 상호 연동이 잘 되면서 오픈소스로 개발된 무료 프로그램입니다. 그래서 홈페이지나 쇼핑몰(워드프레스, Cafe24, 그누보드, 제로보드)등 가장 일반적으로 사용하고 있습니다.

MySQL 설치 :D

MAMP란 웹사이트를 개발할때 쓰이는 기술 스텍인 macOs, Apache, MySQL, PHP의 약어이자 솔루션 스텍이다 https://www.mamp.info/en/downloads/

php 정보 확인

phpInfo()
정보파일 수정 위치 : Loaded Configuration File C:\MAMP\conf\php8.0.1\php.ini
에러 표시 : display_errors = on
캐시 설정 : opcache.enable = 0
PHP 관리자 폐이지 : http://localhost/phpMyAdmin/

MySQL 실행 :D

윈도우 cd c:\MAMP\bin\mysql\bin
로그인 mysql -uroot -proot 
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 5
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.

데이터베이스 :D

데이터베이스 보기 :D

show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+

데이터베이스 만들기 :D

creat 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                |
+--------------------+

데이터베이스 사용 :D

use 데이터베이스 이름;
use sample01;
Database changed

데이터베이스 삭제 :D

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)

mysql>

MySQL 테이블 :D

MySQL 테이블 만들기 :D

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;

MySQL 테이블 전체보기 :D

show tables;
 show tables;
+--------------------+
| Tables_in_sample01 |
+--------------------+
| member             |
+--------------------+
1 row in set (0.00 sec)

MySQL 테이블 보기 :D

desc 테이블 이름;
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 (0.00 sec)

MySQL 테이블 삭제 :D

drop table 테이블 이름;
mysql> drop table member;
Query OK, 0 rows affected (0.01 sec)

mysql> desc member;
ERROR 1146 (42S02): Table 'sample01.member' doesn't exist

MySQL 테이블 삭제 :D

truncate table 테이블 이름;
mysql> truncate table members
Query OK, 0 rows affected (0.01 sec)

mysql> desc member;
ERROR 1146 (42S02): Table 'sample01.member' doesn't exist

MySQL 테이블 데이터 :D

MySQL 데이터 입력하기 :D

INSERT INTO 테이블이름 (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("4", "맛없어" ,"1234567");
INSERT INTO reviews(memberID, youText, regTime) VALUES("7", "맛있어" ,"1234567");
INSERT INTO reviews(memberID, youText, regTime) VALUES("6", "맛없다고","1234567");
INSERT INTO reviews(memberID, youText, regTime) VALUES("5", "맛있다구","1234567");
INSERT INTO reviews(memberID, youText, regTime) VALUES("14", "또먹으러 올게","1234567");
INSERT INTO reviews(memberID, youText, regTime) VALUES("24", "또먹으러 안옴","1234567");
INSERT INTO reviews(memberID, youText, regTime) VALUES("11", "강추","1234567");
INSERT INTO reviews(memberID, youText, regTime) VALUES("19", "비추","1234567");
INSERT INTO reviews(memberID, youText, regTime) VALUES("21", "반가워","1234567");
INSERT INTO reviews(memberID, youText, regTime) VALUES("27", "해위","1234567");
INSERT INTO reviews(memberID, youText, regTime) VALUES("16", "쏘쏘","1234567");

MySQL 데이터 불러오기 :D

SELECT 필드명 FROM TABLE명 WHERE 조건;

전체 데이터 불러오기

select * from member;

memberID가 1인 경우에만 불러오기 

SELECT * FROM member WHERE memberID = '1';

memberID가 1인 경우가 아닌것만 불러오기 

SELECT * FROM member WHERE memberID <> '1';

memberID가 5~10번만 불러오기 

SELECT * FROM member WHERE memberID >= '5' and mymemberID <='10';

youAge가 30~40만 불러오기 

SELECT * FROM member WHERE youAge BETWEEN 30 AND 40;

memberID가 1, 5, 10, 15만 불러오기 

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

youName중에 데이터가 없는 것 불러오기 

SELECT * FROM member WHERE youName NOT NULL;

youName중에 데이터가 있는것 불러오기 

SELECT * FROM member WHERE youName IS NOT NULL;

youName 중에 "연"텍스트가 포함된 이름 불러오기

SELECT * FROM member WHERE LIKE '%연%';

youName 중에 "김"으로 시작하는 이름 불러오기

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

youName 중에 "현"으로 끝나는 이름 불러오기

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

youName 중에 "상"이 포함된 이름 불러오기

SELECT * FROM member WHERE youName like '_상_';

youName 중에 "김" 또는 "이" 로 시작하는 이름 불러오기

SELECT youName FROM member WHERE youName LIKE '김%' or youName LIKE '이%';
또는 SELECT youName FROM member WHERE youName LIKE '김%' || youName LIKE '이%';

25살 이상이면서 김씨 성을 갖고 있는 이름 불러오기

SELECT youName FROM member where youName like '김%' and youAge >='25';

25살 이상이면서 김씨 성을 갖고 있는 이름 불러오기

SELECT youName FROM member where youName like '김__' || youAge >='25';

25살 이상이면서 아이디가 2또는 아이디가 10인 사람 불러오기

SELECT * FROM member where memberID in ('9','2') and youAge >= 25;
또는 SELECT * FROM member where (memberID ='9' or memberid ='2') and youAge >= 25

이름만 불러오기 (내림차순)

SELECT youName FROM member ORDER BY youName desc;

이름만 불러오기 (오름차순)

SELECT youName FROM member ORDER BY youName asc;

회원 이메일만 10개만 불러오기 11-20

SELECT * FROM member limit 5;
    SELECT youEmail FROM member limit 10,10

회원 나이 중복없이 불러오기

SELECT distinct youAge FROM member ;

회원 정보 count()하기

SELECT count(youName) youAge FROM member;
SELECT count(*) youAge FROM member;

MySQL 데이터 수정하기 :D

UPDATETABLE명SET컬럼명 조건

모든 회원의 비밀번호를 1234로 수정하기

UPDATE member SET youPass = '1234';

memberID가 3인 사람의 비밀번호를 9999로 변경

UPDATE member SET youPass = '9999' WHERE memberID ='3';

memberID가 5~10 인 사람의 비밀번호를 7777로 변경

UPDATE member SET youPass = '7777' WHERE memberID BETWEEN 5 AND 10;

비밀번호를 '1234567'로 변경하고 패스워드를 memberID 기준으로 내림차순으로 5개만 변경하기

UPDATE member SET youPass = '1234567' ORDER BY memberID DESC LIMIT 5;

MySQL 데이터 삭제하기 :D

DELETE FROM테이블명WHERE조건

memberID 5번을 삭제 하기 

DELETE FROM member WHERE memberID='5';

memberID를 기준으로 5번째 맴버까지 삭제 

DELETE FROM member ORDER BY memberID ASC limit 5;
SELECT * FROM member ORDER BY memberID ASC;

memberID를 기준으로 7, 8, 11번째 맴버까지 삭제 

DELETE FROM member WHERE memberID IN('7', '8', '11');

테이블수정 :D

필드 추가하기 :D

ALTER TABLE [테이블명] ADD [추가할필드명] AFTER[필드위치]

멤더 테이블에 핸드폰 번호 필드를 추가 

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

멤더 테이블에 핸드폰 번호 필드를 youAge뒤로 추가 

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

필드 수정하기 :D

ALTER TABLE [테이블명] MODIFY [수정할필드명]
ALTER TABLE members MODIFY youPhone INT(20) NOT NULL;

필드 삭제하기 :D

ALTER TABLE [테이블명] DROP [삭제할필드명]
ALTER TABLE members DROP youPhone;

데이터베이스 삭제 :D

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)

테이블 합치기(JOIN) :D

합치기 :D

SELECT [필드명] FROM [테이블명과 엘리어스] JOIN [연결할 테이블명과 엘리어스] ON [기준이 되는 조건문]
select m.youName , m.youEmail, r.youText, r.regTime from members m  join reviews r on m.memberid = r.memberid;

필드명 변경하기(as) :D 

select m.youName , m.youEmail, r.youText, r.regTime as revewTime from members m  join reviews r on m.memberid = r.memberid;

합치기 : 왼쪽 테이블 기준 :D

SELECT [필드명] FROM [테이블명과 엘리어스] JOIN [연결할 테이블명과 엘리어스] ON [기준이 되는 조건문]
select m.youName , m.youEmail, r.youText, r.regTime from members m left join reviews r on m.memberid = r.memberid;

필드 삭제하기 :D

ALTER TABLE [테이블명] DROP [삭제할필드명]
ALTER TABLE members DROP youPhone;

집계함수

합치기 :D

SELECT [필드명] FROM [테이블명과 엘리어스] JOIN [연결할 테이블명과 엘리어스] ON [기준이 되는 조건문]

    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 comment ="성적정보";

    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

합계 구하기

select sum(coding) from schoolRecode;

합계 구하기 (학생아이디가 1~4번까지)

select sum(coding) from schoolRecode where studentID BETWEEN 1 and 4;

가장 높은 코딩점수

select max(coding) from schoolRecode ;

가장 낮은 코딩점수

select min(coding) from schoolRecode ;

코딩 평균 점수

select avg(coding) from schoolRecode ;

그룹별 집계

SELECT [필드명] FROM [테이블명] group by [필드명]

반별로 학생들의 영어점수 평균값 구하기

select class , avg(english) from schoolRecode where class in( 1,2,3,4,5) group by class

반별로 학생들의 수학점수 합계 구하기

select class , sum(math) from schoolRecode where class in( 1,2,3,4,5) group by class

반별로 학생들의 수학점수 합계점수가 70점이상

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

영어점수를 높은순에서 낮은순으로 표시

SELECT studentID , english FROM schoolRecode ORDER BY english DESC;

영어점수를 낮은순에서 높은순으로 표시

SELECT studentID, english FROM schoolRecode ORDER BY english ASC;

수학점수를 반별로 높은순에서 낮은순으로 정렬 

SELECT class, sum(math) from schoolRecode where class is not null group by class order by sum(math) desc;