Re: slow update-join query
Your column renames leave us guessing what's what.
The relevant Explain result is that MySQL cannot find an index for table `t`, which needs an index on whatever col2,col3 are. If they're text, you'll need to specify indexing length.
And, using Float for a version number misuses that type. Be aware that float and double always return rounding errors. Not, probably, what you had in mind.
Edited 1 time(s). Last edit at 06/07/2022 03:09PM by Peter Brawley.
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Re: slow update-join query
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