Recent versions of SQL Server support many different types of index that are used to enhance query performance. These include traditional clustered and nonclustered indexes, which are built on B-tree (balanced-tree) structures and enhance read performance on disk-based tables. There are also indexes that support complex data types, such as XML, JSON, and geospatial data types. These advanced data type indexes are beyond the scope of this book, but a full discussion can be found in the Apress title SQL Server ...
8. Indexes and Statistics
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