Dung Dinh (1/22/2013)
I mean that the columns with data type = uniqueidentifier.
people use them as a key part though it is not recommended to have lengthy keys or indexes it leads to fragmentation
BUT you cant decide whether or which guid typed column will be part of index without looking into query.
-------Bhuvnesh----------
I work only to learn Sql Server...though my company pays me for getting their stuff done;-)