find_churn_risk_customers.sql

Author: stackcats

database/medium/find_churn_risk_customers.sql

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+-- Write your PostgreSQL query statement below
+WITH cte AS (
+    SELECT DISTINCT
+        user_id,
+        FIRST_VALUE(plan_name) OVER (PARTITION BY user_id ORDER BY event_date DESC)      current_plan,
+        FIRST_VALUE(event_type) OVER (PARTITION BY user_id ORDER BY event_date DESC)     current_type,
+        FIRST_VALUE(monthly_amount) OVER (PARTITION BY user_id ORDER BY event_date DESC) current_monthly_amount,
+        MAX(monthly_amount) OVER (PARTITION BY user_id)                                  max_historical_amount,
+        FIRST_VALUE(event_date) OVER (PARTITION BY user_id ORDER BY event_date DESC) -
+        FIRST_VALUE(event_date) OVER (PARTITION BY user_id ORDER BY event_date)          days_as_subscriber
+    FROM subscription_events)
+SELECT
+    user_id,
+    current_plan,
+    current_monthly_amount,
+    max_historical_amount,
+    days_as_subscriber
+FROM cte
+WHERE current_type != 'cancel'
+  AND current_monthly_amount < max_historical_amount / 2.0
+  AND days_as_subscriber >= 60
+ORDER BY days_as_subscriber DESC, user_id