SQL -- Understand Index (Clustered vs. Non-Clustered index)

Here is three articles to help you to understand Index in SQL.

–http://www.itbully.com/articles/sql-indexing-and-performance-part-2-clustered-and-non-clustered

–http://www.devtoolshed.com/content/clustered-index-vs-non-clustered-index-sql-server

–http://odetocode.com/articles/70.aspx