A/B Test AND Sales Funnel using SQL (Codeacademy Mattress Project)

WITH funnels AS (
  SELECT DISTINCT b.browse_date,
     b.user_id,
     c.user_id IS NOT NULL AS 'is_checkout',
     p.user_id IS NOT NULL AS 'is_purchase'
  FROM browse AS 'b'
  LEFT JOIN checkout AS 'c'
    ON c.user_id = b.user_id
  LEFT JOIN purchase AS 'p'
    ON p.user_id = c.user_id)
SELECT browse_date,COUNT(*) AS 'num_browse',
   SUM(is_checkout) AS 'num_checkout',
   SUM(is_purchase) AS 'num_purchase',
   1.0 * SUM(is_checkout) / COUNT(user_id) AS 'browse_to_checkout',
   1.0 * SUM(is_purchase) / SUM(is_checkout) AS 'checkout_to_purchase'
FROM funnels
GROUP BY browse_date
ORDER BY browse_date;

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