关于SQL SERVER里处理字符串的问题
begin
declare @strUserId varchar(50)
set @strUserId=''
select @strUserId=@strUserId+','+cast(StudentID as varchar) from StudentInfo
select @strUserId
end

这样输出的结果如： ，2345，6789，8765，2342，
[解决办法]

begin
declare @strUserId varchar(50)
select @strUserId=ISNULL(@strUserId+',','')+cast(StudentID as varchar) from StudentInfo
WHERE LEN(StudentID )>0
select @strUserId
end