Tối ưu hóa với CTE

WITH payments AS (
  SELECT
    -- Use the correct aggregate to find the highest number of payments
    ___(payment_sequential) AS num_payments,
    order_id
  FROM ecommerce.ecomm_payments 
  -- Group the results by order
  GROUP BY ___)
     
SELECT
  -- Add the correct function to find the length or number of order items
  ___(o.order_items) AS num_items,
  MAX(p.num_payments) AS max_payments
FROM ecommerce.ecomm_orders o
JOIN payments p
-- Add the correct keyword to join using the same column
___ (order_id)
-- Add the correct function to find the length or number of order items
GROUP BY ___(o.order_items)