it seems that you are unaware of NULL keyword , take help from here
http://www.techrepublic.com/blog/datacenter/handling-null-values-in-sql-server-2005/153
PLUS
you query will work like this select * from table where info is null
BUT below wont work
select * from table where info = null
-------Bhuvnesh----------
I work only to learn Sql Server...though my company pays me for getting their stuff done;-)