Create the-most-recent-orders-for-each-product.sql

Author: kamyu104

MySQL/the-most-recent-orders-for-each-product.sql

@@ -0,0 +1,19 @@
+# Time:  O(nlogn)
+# Space: O(n)
+
+SELECT p.product_name,
+       p.product_id,
+       o.order_id,
+       o.order_date
+FROM Products p
+INNER JOIN
+  (SELECT product_id,
+          MAX(order_date) AS first_order_date
+   FROM Orders
+   GROUP BY product_id) tmp
+ON tmp.product_id = p.product_id
+INNER JOIN Orders o
+ON p.product_id = o.product_id AND tmp.first_order_date = o.order_date
+ORDER BY p.product_name,
+         p.product_id,
+         o.order_id;