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MAU monitor (II)

Now that you've built the basis for Carol's MAU monitor, write a query that returns a table of months and the deltas of each month's current and previous MAUs.

If the delta is negative, less users were active in the current month than in the previous month, which triggers the monitor to raise a red flag so the Product team can investigate.

Diese Übung ist Teil des Kurses

<Kurs>Analyzing Business Data in SQL</Kurs>
Kurs ansehen

Übungsanweisungen

  • Fetch the previous month's MAU in the mau_with_lag CTE..
  • Select the month and the delta between its MAU and the previous month's MAU.
  • Order by month in ascending order.

Interaktive praktische Übung

Versuche dich an dieser Übung, indem du diesen Beispielcode vervollständigst.

WITH mau AS (
  SELECT
    DATE_TRUNC('month', order_date) :: DATE AS delivr_month,
    COUNT(DISTINCT user_id) AS mau
  FROM orders
  GROUP BY delivr_month),

  mau_with_lag AS (
  SELECT
    delivr_month,
    mau,
    -- Fetch the previous month's MAU
    COALESCE(
      ___,
    0) AS last_mau
  FROM mau)

SELECT
  -- Calculate each month's delta of MAUs
  ___,
  ___ AS mau_delta
FROM mau_with_lag
-- Order by month in ascending order
ORDER BY ___;
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