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sql server 2008: Included columns

Posted on 2011-03-20
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hi experts,
i am reading about
Included columns (Nonkey columns included in index and Improve query coverage and performance)

My question is, what is the difference between Included columns and alter an index,
 For example
 I have a key index NONCLUSTERED the title and I want to add the column author, who use
 1. included column
 or
 2. alter index NONCLUSTERED
 Which is better? whats the difference?
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Question by:enrique_aeo
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