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1635. Hopper Company Queries I

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WITH RECURSIVE
  Calendar AS (
    SELECT 1 AS month
    UNION ALL
    SELECT month + 1
    FROM Calendar
    WHERE month < 12
  )
SELECT
  Calendar.month,
  (
    SELECT COUNT(*)
    FROM Drivers
    WHERE
      YEAR(Drivers.join_date) < '2020'
      OR (
        YEAR(Drivers.join_date) = '2020'
        AND MONTH(Drivers.join_date) <= Calendar.month)
  ) AS active_drivers,
  (
    SELECT COUNT(*)
    FROM AcceptedRides
    INNER JOIN Rides
      USING (ride_id)
    WHERE
      YEAR(Rides.requested_at) = '2020'
      AND MONTH(Rides.requested_at) = Calendar.month
  ) AS accepted_rides
FROM Calendar;
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