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A way to generate a subscription id and group transactions per subscription per user
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| WITH aggregated_subs AS ( | |
| SELECT | |
| USER_ID | |
| ,PRODUCT_ID | |
| ,TRANSACTION_START | |
| ,TRANSACTION_DATE_DUE | |
| ,ROW_NUMBER() OVER (PARTITION BY PRODUCT_ID ORDER BY TRANSACTION_START) AS rn | |
| ,LAG(TRANSACTION_DATE_DUE, 1) OVER (PARTITION BY PRODUCT_ID ORDER BY TRANSACTION_DATE_DUE) AS previous_sub_end | |
| FROM SUBSCRIPTIONS | |
| -- ORDER BY TRANSACTION_START, rn | |
| ) | |
| , subscription_series AS ( | |
| SELECT * | |
| , DATEDIFF(DAY, previous_sub_end, TRANSACTION_START) AS diff | |
| , IFF(diff > 0 OR diff is null, 1, 0) AS subscription_serie_start_idx | |
| , SUM(subscription_serie_start_idx) OVER (ORDER BY USER_ID, rn) AS subscription_serie_id | |
| FROM aggregated_subs | |
| ) | |
| SELECT | |
| USER_ID | |
| ,PRODUCT_ID | |
| ,MIN(TRANSACTION_START) AS sub_series_start | |
| ,MAX(TRANSACTION_DATE_DUE) AS sub_series_end | |
| ,COUNT(subscription_serie_id) AS num_payments | |
| ,DATEDIFF(MONTH, sub_series_start, sub_series_end) AS sub_series_length_in_months | |
| FROM subscription_series | |
| GROUP BY USER_ID, PRODUCT_ID | |
| ORDER BY USER_ID ASC, PRODUCT_ID ASC, sub_series_start ASC |
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