Mock_SQL2-Punya

Customers Who Bought All Products

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+
+select distinct(c.customer_id) from customer c right join product p on c.product_key=p.product_key group by c.customer_id having count( distinct p.product_key) = (select count(distinct(product_key)) from product)

Sales Analysis III

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+WITH cte AS (
+    SELECT 
+        product_id, 
+        year, 
+        quantity, 
+        price,
+        RANK() OVER (PARTITION BY product_id ORDER BY year ASC) AS rnk
+    FROM Sales
+)
+SELECT 
+    product_id, 
+    year AS first_year, 
+    quantity, 
+    price
+FROM cte
+WHERE rnk = 1;