数字转字母，字母转数字

--输出A-Z
declare @charAscii int
declare @counter int
set @charAscii=65 --A的ascii
set @counter=0
while @counter<26
begin
print char(@charAscii + @counter)
set @counter=@counter+1
end
--数字转字母
select char(65)+char(65)
select char(66)
select char(90)
--字母转数字
select ASCII('A')
select ASCII('B')
select ASCII('Z')