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Answers and rating deltas for

Why does MySQL not use an index when executing this query?

Author Votes Δ
Quassnoi 3 +0.35
nathan 2 +2.80
Artem Russakovskii 1 +1.12
Marcus Griep 0 -2.34
Jim Ferrans 0 -1.95
Phil Carter 0 -2.15
Last visited: Sep 14, 2014, 5:07:29 AM