<ul><li>Indexes in SQL are special data structures designed to optimize the speed of data retrieval operations from database tables.</li><li>There are two types of indexes in SQL: clustered index and non-clustered index.</li><li>A clustered index determines the physical order of data in a table, while a non-clustered index creates a separate structure with pointers to the physical data.</li><li>Clustered indexes are efficient for range queries and faster retrieval for queries filtering on the clustered index column, while non-clustered indexes improve performance for queries on non-primary key columns.</li></ul>

Indexes in SQL | Clustered and Non Clustered Index

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