創建表

快速到底

學生表

create table student(  
  id int(11) not null AUTO_INCREMENT,
  name varchar(30),
  address varchar(40),
  primary key (id)
) engine=innodb charset=utf8;

INSERT INTO student(name,address) VALUES(‘田開智‘,‘安徽省天長市‘);
INSERT INTO student(name,address) VALUES(‘陶滬生‘,‘安徽省銅陵市‘);
INSERT
 
 INTO student(name,address) VALUES(‘石冬冬‘,‘安徽省安慶市‘);
INSERT INTO student(name,address) VALUES(‘魏忠原‘,‘安徽省滁州市‘);
INSERT INTO student(name,address) VALUES(‘田永恒‘,‘安徽省阜陽市‘);
INSERT INTO student(name,address) VALUES(‘熊發揮‘,‘安徽省天長市‘);

成績表

create table chengji(  
  id int(11) not null AUTO_INCREMENT,
  socre 
 
float(5,2),
  primary key (`id`)
) engine=innodb charset=utf8;

INSERT INTO chengji(socre) VALUES(95.54);
INSERT INTO chengji(socre) VALUES(124.4);
INSERT INTO chengji(socre) VALUES(130.0);
INSERT INTO chengji(socre) VALUES(135);
INSERT INTO chengji(socre) VALUES(149.547);

INSERT INTO chengji(id,socre) VALUES
 
(7,140);

內鏈接

內鏈接文氏圖

左外連接

左外連接文氏圖

右外連接

右外連接文氏圖

左連接

左連接文氏圖

右連接

右連接文氏圖

全連接

全連接文氏圖

去掉交集

文氏圖

MySQL 的七種 Join