Add files via upload

Author: ecocity-coder

final_data.csv

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+SELECT *
+FROM final_data
+LIMIT 10;

final_data.sql

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+WITH CTE AS (
+    SELECT
+        customer_id,
+        contract_id,
+        contract_serial_number,
+        issue_dt,
+        loan_amount,
+        EXTRACT(YEAR FROM issue_dt) AS year,
+        EXTRACT(MONTH FROM issue_dt) AS month,
+        FIRST_VALUE(loan_amount) OVER (PARTITION BY customer_id ORDER BY issue_dt) AS first_loan_amount,
+        LAST_VALUE(loan_amount) OVER (PARTITION BY customer_id ORDER BY issue_dt RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) AS last_loan_amount,
+        RANK() OVER (PARTITION BY EXTRACT(YEAR FROM issue_dt), EXTRACT(MONTH FROM issue_dt) ORDER BY contract_serial_number DESC) AS rank
+    FROM final_data
+    WHERE EXTRACT(YEAR FROM issue_dt) = 2019
+)
+
+SELECT
+    year,
+    month,
+    customer_id,
+    MAX(contract_serial_number) AS max_contract_serial_number,
+    (last_loan_amount / NULLIF(first_loan_amount, 0)) AS loan_growth_factor
+FROM CTE
+WHERE rank = 1
+GROUP BY year, month, customer_id, first_loan_amount, last_loan_amount
+ORDER BY year, month, customer_id;
+