20220120104903

WITH
  users AS (
  SELECT
    * EXCEPT (timestamp), timestamp as registrationTimestamp
  FROM
    `logs.registeredUsers` WHERE schedule != "original" AND schedule != "aggressiveStart" AND timestamp >= TIMESTAMP("2021-04-19")),
  initialReviews AS (
  SELECT
    DISTINCT userID,
    registrationTimestamp,
    schedule,
    cardID
  FROM
    (SELECT * EXCEPT (reviewCount), RANK() OVER (PARTITION BY userID, cardID ORDER BY timestamp) AS reviewCount FROM `logs.reviews`)
  JOIN
    `users`
  USING
    (userID)
  WHERE
    sessionID IS NULL AND reviewCount = 1 AND reviewMarking = "forgotten" AND
    cardID IN(
    SELECT
      cardID
    FROM
      `logs.latestEssaysCards`
    WHERE
      essayName="qcvc")
   ),
  subsequentReviews AS (
  SELECT
    *,
    RANK() OVER (PARTITION BY userID, cardID ORDER BY timestamp) AS realReviewCount
  FROM
    `logs.reviews`
  JOIN
    initialReviews
  USING
    (userID,
      cardID)
  WHERE
    sessionID IS NOT NULL AND isRetry IS NOT TRUE),
  firstSession AS (
    SELECT userID, cardID FROM subsequentReviews WHERE realReviewCount = 1 AND beforeInterval=1000*60*60*24
  ),
  validUsers AS (SELECT userID FROM `logs.reviews` WHERE beforeInterval > 1000*60*60*24*5 AND cardID IN (SELECT cardID FROM `logs.latestEssaysCards` WHERE essayName="qcvc") AND sessionID IS NOT NULL GROUP BY userID HAVING COUNT(DISTINCT cardID) >= 103),
  firstFollowup AS (SELECT userID, cardID, MIN(realReviewCount) AS realReviewCount FROM subsequentReviews JOIN firstSession USING (userID, cardID) WHERE beforeInterval > 1000*60*60*24 GROUP BY userID, cardID),
  followupSession AS (SELECT userID, cardID, beforeInterval, realReviewCount, reviewMarking FROM subsequentReviews AS s JOIN firstFollowup USING (userID, cardID, realReviewCount) JOIN validUsers USING (userID))

SELECT
followupSession.beforeInterval / (1000*60*60*24) AS days,
  COUNT(DISTINCT userID) AS N,
  COUNT(*) AS promptN,
  COUNTIF(reviewMarking="remembered") / COUNT(*) AS accuracy
FROM
followupSession
GROUP BY
days
ORDER BY
days