/*
  擴充 Northwind 定義不足之處, 配合進階 SQL 語法使用
  擴充後為完整的 DB
*/

-- 部門檔
create table Department (
  DepartmentID varchar(4) not null,
  DepartmentName nvarchar(20) not null,
  ManagerID int,  -- 部門主管 
  primary key(DepartmentID)
);

insert into Department (DepartmentID,DepartmentName,ManagerID) Values ('A1','總管理處',1),('S1','北區業務部',2),('S2','南區業務部',3);

-- 員工薪資
Alter Table Employees Add DepartmentID varchar(4);
Alter Table Employees Add Salary int;

update Employees set DepartmentID = '', Salary = 10000 where EmployeeID = 1;
update Employees set DepartmentID = '', Salary = 10000 where EmployeeID = 2;