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Re: Very slow query when too many joins
Posted by: Rick James
Date: June 07, 2016 03:40PM

If all (or most) rows need the same 'attributes', then they should be columns. If you have different attributes for different rows, then JSON is better. Example: A shopping site with cameras, dresses, tools, etc, all in the same table.

More on the evils of EAV: http://mysql.rjweb.org/doc.php/eav .

Joomla can get away with whatever it says because it does not plan on implementers having more than a few hundred items in their tables.

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Very slow query when too many joins
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As Os
June 05, 2016 09:17AM
Re: Very slow query when too many joins
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June 05, 2016 09:27AM
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Peter Brawley
June 05, 2016 10:14AM
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June 05, 2016 10:48AM
Re: Very slow query when too many joins
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Peter Brawley
June 05, 2016 10:56AM
Re: Very slow query when too many joins
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As Os
June 05, 2016 03:33PM
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Peter Brawley
June 05, 2016 03:41PM
Re: Very slow query when too many joins
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Rick James
June 05, 2016 05:36PM
Re: Very slow query when too many joins
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As Os
June 06, 2016 02:23AM
Re: Very slow query when too many joins
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As Os
June 06, 2016 03:33AM
Re: Very slow query when too many joins
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As Os
June 06, 2016 08:36AM
Re: Very slow query when too many joins
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Peter Brawley
June 06, 2016 08:52AM
Re: Very slow query when too many joins
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As Os
June 06, 2016 09:02AM
Re: Very slow query when too many joins
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Peter Brawley
June 06, 2016 11:16AM
Re: Very slow query when too many joins
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Peter Brawley
June 06, 2016 08:29AM
Re: Very slow query when too many joins
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As Os
June 06, 2016 11:30AM
Re: Very slow query when too many joins
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Peter Brawley
June 06, 2016 12:08PM
Re: Very slow query when too many joins
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As Os
June 06, 2016 02:11PM
Re: Very slow query when too many joins
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Rick James
June 07, 2016 03:40PM
Re: Very slow query when too many joins
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james wang
July 20, 2016 05:34AM
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Rick James
July 20, 2016 09:37AM
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james wang
July 21, 2016 04:43AM
Re: Very slow query when too many joins
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Rick James
July 22, 2016 10:59PM


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