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+# 1045. Customers Who Bought All Products
+# Write your MySQL query statement below
+SELECT  customer_id
+FROM Customer 
+GROUP BY customer_id
+HAVING COUNT(distinct product_key) = (select COUNT(product_key) FROM Product);
+
+# 1070. Product Sales Analysis III
+# Write your MySQL query statement below
+SELECT product_id, year AS first_year, quantity, price
+FROM Sales
+WHERE (product_id, year) IN (
+    SELECT product_id, MIN(year) as firstyear
+    FROM Sales
+    GROUP BY product_id
+)
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