一个游标简单例子

use Northwind
go

drop table backuptable
go
create table backuptable
(
 -- Eid int identity(1,1),
  Eid int,
  Ename varchar (50) not null ,
  --constraint pk_Eid primary key (Eid),
)
go

declare OrderCursor cursor --声明一个游标
for
select EmployeeID from Orders group by EmployeeID
go

declare @E_name varchar (50)
declare @OrdersCount int
declare @EmpID int

open OrderCursor--打开游标

fetch next from OrderCursor into @EmpID --先读到第一个记录

while(@@fetch_status=0)--判断是否读到了记录
 begin
 
 set @E_name=(select LastName+'-'+FirstName from Employees where EmployeeID=@empID)
 set @OrdersCount=(select count(*) from Orders where EmployeeID=@empID)
 insert into backuptable(Eid,Ename) values (@empID,@E_name)
 
 
 fetch next from OrderCursor into @EmpID --读到下一个记录
 end

close OrderCursor--关闭游标

DEALLOCATE OrderCursor--释放游标