Rezultatul final: | customer_id | gap_days | |-------------|----------| | 1 | 123 | | 2 | 120 | cu cte ca( select order_id, customer_id, order_dt, lag(order_dt) over(partition by customer_id order by order_dt) ca prev_order_ft, datediff(day, prev_order_ft, order_dt) ca gap_days din Orders ) selectați customer_id, max(gap_days) ca gap_days din cte unde gap_days > 60 grupuți după customer_id