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-# Mock_SQL2
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+# Mock_SQL2
+ Problem1: Customers Who Bought All Products(https://leetcode.com/problems/customers-who-bought-all-products/description/)
+ Solution:
+
+Select c.customer_id 
+from Customer c
+inner join Product p
+on c.product_key = p.product_key 
+group by c.customer_id 
+having count(distinct c.product_key) = (select count(*) from Product)
+
+Problem2: Product Sales Analysis |||(https://leetcode.com/problems/product-sales-analysis-iii/description/)
+Solution:
+
+SELECT product_id, year AS first_year, quantity, price 
+FROM  Sales 
+WHERE (product_id, year) IN (
+    SELECT product_id, MIN(year) AS year 
+    FROM Sales 
+    GROUP BY product_id
+  );
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