Answer / Vipin Singh Rajput

In SQL databases, there are typically three main types of indexes: clustered indexes, non-clustered indexes (also known as heap-organized indexes), and unique indexes. Clustered indexes sort the data physically based on the indexed column(s) and can have only one per table. Non-clustered indexes do not sort the data physically but instead maintain a separate structure with pointers to the actual data rows. Unique indexes ensure that each indexed value in a table is unique, much like a primary key.

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