Closed saikoneru1997 closed 1 week ago
Answer: "You can use the LAG function to get the previous order date and then calculate the difference. For example:
SELECT customer_id, order_date,
order_date - LAG(order_date) OVER (PARTITION BY customer_id ORDER BY order_date) AS order_date_diff
FROM orders;
This query will return the difference in order dates between consecutive orders for each customer."
Answer: "You can use the SUM function with the OVER clause to get the cumulative sum. For example:
SELECT customer_id, order_date, order_total,
SUM(order_total) OVER (PARTITION BY customer_id ORDER BY order_date) AS cumulative_sum
FROM orders;