Create 1596-the-most-frequently-ordered-products-for-each-customer.sql

Author: everthis

1596-the-most-frequently-ordered-products-for-each-customer.sql

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+# Write your MySQL query statement below
+SELECT customer_id, product_id, product_name
+FROM (
+    SELECT O.customer_id, O.product_id, P.product_name, 
+    RANK() OVER (PARTITION BY customer_id ORDER BY COUNT(O.product_id) DESC) AS rnk
+    FROM Orders O
+    JOIN Products P
+    ON O.product_id = P.product_id  
+    GROUP BY customer_id, product_id
+) temp
+WHERE rnk = 1 
+ORDER BY customer_id, product_id;