use Library
go
declare @position int,@string char(15) ——声明变量
set @position=1
set @string='BeiJing' ——变量赋值
while @position<=datalength(@string)
begin
select ASCii(substring(@string,@position,1))as ASCCode,
char (AScii(substring(@string,@position,1)))as ASCChar
set @position = @position+1
end
go

请高手解释下，变量赋值有的循环语句

select ASCii(substring(@string,@position,1))as ASCCode,
char (AScii(substring(@string,@position,1)))as ASCChar

这句是什么意思，斑竹能解释下吗

哦
string函数的参数是什么意思啊，实在看不懂这个
select ASCii(substring(@string,@position,1))as ASCCode,
char (AScii(substring(@string,@position,1)))as ASCChar

这两个语句不是一样吗，为什么后一句要把ASCII一起括起来？？？请教