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Kris, •Do we really think that we will see a measurable performance gain here? If so, how can we quantify it aside from looking at the space used in the query above? That depends, but my gut instinct with the data you've given is - no. Sure, you'll potentially save some of that space as a plan stub will still take memory just not all that much ...


Try: LEFT OUTER JOIN TaskItems AS TI ON O.OwnerId = TI.OwnerId AND LastOperationTime IS NOT NULL The engine could be grabbing the Null row separately, as it's a slightly different scenario to not finding one. But as you essentially want the same behaviour, just out the explicit filter in there, within the ON clause of your LEFT JOIN. Then the only NULLs ...

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