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Re: why the two query has a different execute plan?
Posted by: Rick James
Date: August 26, 2016 02:29PM

Corollary to Øystein's answer: Spell out the columns you need instead of simply saying "*".

You will want utf8mb4; there are Chinese characters missing from utf8.

Why have `id` when `user_id` looks like a perfectly good column for the PRIMARY KEY? Ditto for `customer_id` on the other table.

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Re: why the two query has a different execute plan?
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August 26, 2016 02:29PM


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