How can I speed up queries on a large table?

Any process or action that requires querying the database and getting results can be optimized by adding database indexes. An index is used to speed up the performance of queries. It does this by reducing the number of database data pages that must be visited/scanned. In SQL Server, a clustered index determines the physical order of data in a table. There can be only one clustered index per table (the clustered index IS the table) What is an index?So, what is an index? Well, an index is a data structure...