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Microsoft® SQL Server 2008 R2 Unleashed
book

Microsoft® SQL Server 2008 R2 Unleashed

by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
September 2010
Intermediate to advanced content levelIntermediate to advanced
1704 pages
111h 8m
English
Sams
Content preview from Microsoft® SQL Server 2008 R2 Unleashed

Determining the Optimal Join Order

In addition to determining the best join strategies, the Query Optimizer also evaluates and determines the optimal join order that would result in the most efficient query plan. In the query’s execution plan, you might find that the order of the tables in the execution plan is a different order than specified in the query. Regardless of the join strategy used, the Query Optimizer needs to determine which table is the outer input and which is the inner input to the join strategy chosen. For example, consider the following query:

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In addition to the possible access paths and join strategies available, the server ...

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Publisher Resources

ISBN: 9780768696585Purchase book