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In the context of a database, optimisation refers to the process of the query optimiser selecting an efficient physical execution plan.

2 votes

Optimize IN clause in where query with order by - MySQL

I was looking at a very similar problem today. After doing a ton of searching online, I found this great article by Percona. Using "UNION ALL", you can join together a list of queries, like so: (SE …
Adam Easterling's user avatar