What is Sparse columns in SQL Server?

Refer:http://msdn.microsoft.com/en-us/library/cc280604.aspx

I think there is another thread on sparse columns...you may follow it up:

http://social.msdn.microsoft.com/Forums/en-US/sqldatabaseengine/thread/e06023fd-8e80-4232-8dee-a68b222eb610

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