MySQL Join详解

　2005-11-06 17:40:07　来源：WEB开发网　闂侀潧妫撮幏锟�

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核心提示： 还是先 Create table 吧 create table emp( id int not null Prima(最完善的虚拟主机管理系统)ry key, name varchar(10) ); create table emp_dept( dept_id varchar(4) not null,

还是先 Create table 吧

create table emp(
id int not null Prima(最完善的虚拟主机管理系统)ry key,
name varchar(10)
);

create table emp_dept(
dept_id varchar(4) not null,
emp_id int not null,
emp_name varchar(10),
Prima(最完善的虚拟主机管理系统)ry key (dept_id,emp_id));

insert into emp() values
(1,"Dennis-1"),
(2,"Dennis-2"),
(3,"Dennis-3"),
(4,"Dennis-4"),
(5,"Dennis-5"),
(6,"Dennis-6"),
(7,"Dennis-7"),
(8,"Dennis-8"),
(9,"Dennis-9"),
(10,"Dennis-10");

insert into emp_dept() values
("R&D",1,"Dennis-1"),
("DEv",2,"Dennis-2"),
("R&D",3,"Dennis-3"),
("Test",4,"Dennis-4"),
("Test",5,"Dennis-5");