Chapter 4 Reference 45
Using Covering Indexes to Improve Query Performance
Open the original at red-gate.comAs cited in DDIA
Joe Webb. "Using Covering Indexes to Improve Query Performance." simple-talk.com, September 2008. Archived at perma.cc/6MEZ-R5VR
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Using Covering Indexes to Improve Query Performance | Simple Talk
Designers of database systems will often assume that the use of a clustered index is always the best approach. However the nonclustered Covering index will usually provide the optimum performance of a query.
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