Hash Index

Hash indexing may improve performance on large data types, like VARCHAR.  PostgreSQL supports it.  But, TSQL does not.  In this case, we can still manually create a hash value and index it.

http://msdn.microsoft.com/en-us/library/ms191241(v=sql.105).aspx

http://stackoverflow.com/questions/318219/sql-server-hash-indexes

http://clay.lenharts.net/blog/2008/02/03/sql-server-hash-indexes/

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