MySQL Join Sub-Select Optimization?

You will want to add an index on job_responses(date_created, user_id). Then you can drop the current single-column index on date_created .

It ended up being easier and way faster to generate a temporary table, populate it, and then use a join on that table. I was "chunking" the original query, which ends up being very expensive when it has to create and destroy tables created by sub-selects.

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