declare @a int, @b int ,@c int --变量
declare test_1_cursor cursor SCROLL --声明游标
for select * from test_1 
open test_1_cursor --打开游标
fetch last from test_1_cursor --最后一行数据
fetch RELATIVE -2 from test_1_cursor --当前行的第2行。
close test_1_cursor --结束游标
deallocate test_1_cursor --释放游标

自定义一个学生表（学号、姓名和性别），利用游标
   读取表中数据并输出。
*/
--创建一个学生表student：
go 
IF OBJECT_ID('student') is not null
drop table student
go 
create table student(
id int ,
name varchar(10),
gender int check(gender=1 or gender=2)
)
--使用批处理插入一些数据：
go
insert into student values(1001,'tracy',1)
insert into student values(1002,'lily',2)
insert into student values(1003,'kobe',1)
insert into student values(1004,'lucy',2)
insert into student values(1005,'nash',1)

declare cur cursor for select *from student
declare @id int,@name varchar(10),@gender int
open cur
fetch next from cur into @id,@name,@gender
while @@fetch_status=0
begin 
  print ltrim(str(@id))+','+@name+','+ltrim(str(@gender))
  fetch next from cur into @id,@name,@gender
end  
  close cur
  deallocate cur