HOW-TO:Share libraries using MySQL: Wiki Edition
Here's the reason for adding "SET SESSION optimizer_switch = 'derived_merge=off'":

Unless something has now changed in MySQL 5.7.x, you can either have slow-ish (but working) queries, or queries that are unable to delete from tables in a subquery.

We opted for the working queries. I assume the delete from subquery restriction still exists in MySQL 5.7.18?

Is going back to MySQL 5.6.x an option? Or try MariaDB, maybe it doesn't have a query optimiser from the 1990s.
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RE: HOW-TO:Share libraries using MySQL: Wiki Edition - by Milhouse - 2017-07-25, 07:07

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