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A database structure that can improve the speed of queries at the cost of disk space and slower inserts/updates. It stores a copy of one or more columns sorted but structures the data differently to allow faster access.

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What is the difference between these two index declarations and do I need both?

[TableA] ([ColA]) INCLUDE ([ColB]) GO CREATE NONCLUSTERED INDEX [TableA_ColB_ColA] ON [dbo]. … It seems to me if I have the second index the first one is redundant? …
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