一个简单的字符串转换！
DECLARE @SS bigint

SET @SS=9999999999999


把上面的的ＳＳ转换为字符串， 9,999,999,999,999

[解决办法]
DECLARE @SS bigint

SET @SS=9999999999999
select convert(varchar(200),cast(@ss as money),3)