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MySQL Query Patterns, Optimized – Webinar questions followup

 | June 3, 2013 |  Posted In: Insight for Developers, MySQL, MySQL Webinars

On Friday I gave a presentation on “MySQL Query Patterns, Optimized” for Percona MySQL Webinars.  If you missed it, you can still register to view the recording and my slides. Thanks to everyone who attended, and especially to folks who asked the great questions.  I answered as many as we had time for  during the session, but here […]

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When the subselect runs faster

 | March 18, 2010 |  Posted In: Insight for Developers, MySQL

A few weeks ago, we had a query optimization request from one of our customer. The query was very simple like:

This column in the table is looks like this:

The table have 549252 rows and of course, there is an index on the col1. MySQL estimated the cardinality of that index as […]

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