That is the question from SSP forums asking about the internal representation of data types in SQL Server. Here is further explanation for that questions where I picked up new information too. Back to the basics, that all the data that needs to be stored...
SQLServer-QA.net - Knowledge Sharing Network (SSQA.net)
Fri, Jul 16 2010
Filed under: Filed under: sql server, query, storage, varchar, column, char, format, number, data types, numeric, precision, integer