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Old 09-28-2017, 02:45 AM   #35
sathyamelectron
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Join Date: Sep 2017
Posts: 81
An index is a copy of selected columns of data from a table that can be searched very efficiently that also includes a low-level disk block address or direct link to the complete row of data it was copied from. Some databases extend the power of indexing by letting developers create indexes on functions or expressions.
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