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Difference between clustered and non-clustered index. Both stored as B-tree structure. The leaf level of a clustered index is the actual data where as leaf level of a non-clustered index is pointer to data. We can have only one clustered index in a table but we can have many non-clustered index in a table. Physical data in the table is sorted in the order of clustered index while not with the case of non-clustered data.
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