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数据库学习:MySQLJoin详解

 2007-11-11 15:38:54 来源:WEB开发网   
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,emp_id int not

  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");

Tags:数据库 学习 MySQLJoin

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