[Solved] mysql query optimiser better performance from subquery with partitions than left join with index

How to optimize this SQL query?

In case you have your own slow SQL query, you can optimize it automatically here.

For the query above, the following recommendations will be helpful as part of the SQL tuning process.
You'll find 3 sections below:

  1. Description of the steps you can take to speed up the query.
  2. The optimal indexes for this query, which you can copy and create in your database.
  3. An automatically re-written query you can copy and execute in your database.
The optimization process and recommendations:
  1. Prefer Direct Join Over Joined Subquery (query line: 8): We advise against using subqueries as they are not optimized well by the optimizer. Therefore, we recommend to replace subqueries with JOIN clauses.
The optimized query:
        SQL_NO_CACHE request_time,
        b c USING (id) 
        request_time BETWEEN '2015-06-28 10:00:00' AND '2015-06-28 11:00:00'

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* original question posted on StackOverflow here.