use StudentManageDB

 go

 --声明学号变量

 declare @stuid int,@stuname varchar(20)

 --查询李铭的信息

 set @stuname='李铭'

 select StudentId,StudentName,Gender,StudentIdNo from Students

 where StudentName=@stuname

 --查询李铭的学号

 select @stuId=StudentId from Students where StudentName=@stuname

 --查询与李铭学号相邻的学员

 select StudentId,StudentName,Gender,StudentIdNo from Students

 where StudentId=(@stuId+1) or StudentId=(@stuId-1)

     declare @stuAddress nvarchar(100) , @stuName nvarchar(100)

     --set @stuAddress='天津', @stuName='张三'                            --不允许这样赋值

     select @stuaddress='天津', @stuName='王小虎'             --允许

     --set @stuAddress = (select StudentAddress from Students)  --不允许

     select @stuAddress = StudentAddress from Students    --得到最后一个

     set @stuAddress = (select StudentAddress from Students where 1<0) --NULL值

     select @stuAddress =  StudentAddress from Students where 1<0        --保持原值

 PRINT  '服务器的名称: ' + @@SERVERNAME

 PRINT 'SQL Server的版本' + @@VERSION 

 SELECT  @@SERVERNAME  AS  '服务器名称'

 SELECT  @@VERSION  AS  'SQL Server的版本' 

 use StudentManageDB

 go

 --插入学员信息

 insert into Students (StudentName,Gender,Age,Birthday,StudentIdNo,

 PhoneNumber,StudentAddress,ClassId)

 values('王小欣','男',28,'1988-08-07',120223198808071111,

 '022-22222222','天津市南开区',10)

 --获取最后一条SQL语句的执行错误号

 print @@error