Thank you for the confidence Ksharp, but I suspect those may have been someone else's recommendations. Bob Virgle did a fair number of tests on these statements in his efficiencies book a number of years ago. And while I did write about the relative efficiencies in the narrow context of performing table look ups. I would defer to Cynthia's comment that you need to know your data, your machine, your situation. That said I find the differences between the comparisons on numerics and characters to be very interesting and probably worthy of more research.
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