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Re: Optimizing a query with a NULL
Posted by: Rick James
Date: August 23, 2011 08:18AM

Here's the problem:
> KEY `Invoices` (`InvoiceID`(8))
"Prefix" indexes are next to worthless. Do not use them unless the field is too big to allow an index at all.

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Written By
August 22, 2011 11:04AM
Re: Optimizing a query with a NULL
August 23, 2011 08:18AM

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