I was going to ask how to optimize the SQL in your post as it seems like the obvious/naive implementation of the query. If you're missing something, so am I. I

I was going to ask how to optimize the SQL in your post as it seems like the obvious/naive implementation of the query. If you're missing something, so am I. I can only imagine it was built up over time from googling specific terms that already missed the point, e.g. "rds mySQL union query"