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What is the difference between a clustered and non-clustered index?

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Compare index types.

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A clustered index determines the physical row order (one per table; the table itself is the index — e.g. the primary key). A non-clustered index is a separate structure pointing to rows; you can have many. Clustered is fast for range scans on its key.

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SQLClustered vs. Non-Clustered Indexing Playground
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