'Split, Sort & Collapse' is, happily, not a description of the intrepid Fabiano after his epic series of articles about the ShowPlan operators. With renewed stamina, Fabiano continues his mission to describe all the major operators by explaining the Trivial Plan and the power of unique indices.
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If you've ever wondered what happens to your queries if you're not conscientious about creating indexes, then Fabiano Amorim has yet another nugget of Execution Plan wisdom for you. The Query Optimizer's solution is to use the Nonclustered Index Spool, and we're about to learn why.… Read more