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The Voice of the DBA

Steve Jones is the editor of SQLServerCentral.com and visits a wide variety of data related topics in his daily editorial. Steve has spent years working as a DBA and general purpose Windows administrator, primarily working with SQL Server since it was ported from Sybase in 1990. You can follow Steve on Twitter at twitter.com/way0utwest

Does Join Order Matter?

According to Conor Cunningham, it doesn’t.

I have heard that there are issues in the optimizer, and to be sure, there are cases where the order can matter, but for most normal queries, most inner joins, order doesn’t matter. As Conor says, it might seem that a change produces a new plan or changes the performance, but don’t assume that this correlation implies causality.

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