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Explaining the Difference Between Clustered and Non-Clustered Indexes in SQL Server
Clustered and non-clustered indexes in SQL Server are two types of indexes used to enhance database performance.
Clustered Index:
A clustered index in SQL Server physically orders the data rows of a table on the disk based on the indexed column. Each table can have only one clustered index, and it determines the physical order of the data.
Non-Clustered Index:
In contrast, a non-clustered index does not alter the physical order of data on the disk. Instead, it creates a separate structure that points to the actual data rows. Multiple non-clustered indexes can be created on a single table.
One of the key differences between clustered and non-clustered indexes is that a clustered index directly affects the order of the data on disk, while a non-clustered index does not. Depending on the query requirements, choosing between a clustered and non-clustered index can significantly impact database performance.
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