What is the difference between clustered and non clustered indexes?

What is the difference between clustered and non clustered indexes?


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  • A clustered index actually describes the order in which records are physically stored on the disk, hence the reason you can only have one. A Non-Clustered Index defines a logical order that does not match the physical order on disk. Aclustered index is essentially a sorted copy of the data in the indexed columns.

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