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&gt;&gt;&gt;btw...for a covering index, it needs to be composite, and has to be a nonclustered index.<br />
It is possible for a covering index to be clustered.<br />

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>>>btw...for a covering index, it needs to be composite, and has to be a nonclustered index.
It is possible for a covering index to be clustered.


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&gt;&gt;It is possible for a covering index to be clustered.&lt;&lt;<br />
You may want to double check that.
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>>It is possible for a covering index to be clustered.<<
You may want to double check that.

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What is the difference between a composite index and a covering index?
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What is the difference between a composite index and a covering index?

Composite Index vs Covered Index

Microsoft SQL Server 2005 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. It includes support for managing XML data and allows a database server to be exposed over web services using Tabular Data Stream (TDS) packets encapsulated within SOAP (protocol) requests.

Microsoft SQL Server 2005

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.