Answer
Clustered index: Defines physical row order.
Non-clustered index: A separate structure pointing to actual rows.
Quick Answer
Clustered index defines the physical order of rows in the table — only one per table. Non-clustered index is a separate structure with pointers back to the actual rows — you can have many. Clustered is faster for range queries; non-clustered is better for selective lookups on specific columns.
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SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ