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What are all the different types of indexes?

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There are three types of indexes -.

  • Unique Index.

This indexing does not allow the field to have duplicate values if the column is unique indexed. Unique index can be applied automatically when primary key is defined.

  • Clustered Index.

This type of index reorders the physical order of the table and search based on the key values. Each table can have only one clustered index.

  • NonClustered Index.

NonClustered Index does not alter the physical order of the table and maintains logical order of data. Each table can have 999 nonclustered indexes.