Completed MockSQL2

01-CustomersWhoBoughtAllProducts.sql

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+-- Mock Interview Question 1 - Customers Who Bought All Products (https://leetcode.com/problems/customers-who-bought-all-products/)
+
+-- Selecting all the customer_id from the Customer Table where we are checking if the number of distinct product keys from both the customer and product table match
+
+SELECT customer_id
+FROM Customer
+GROUP BY customer_id
+HAVING COUNT(DISTINCT product_key) = (SELECT COUNT(product_key) FROM Product);

02-ProductSalesAnalysis-III.sql

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+-- Mock Interview Question 2 - Product Sales Analysis III (https://leetcode.com/problems/product-sales-analysis-iii/)
+
+-- Writing an inner subquery for filtering minimum year and getting matching quantity and price for that year
+
+SELECT product_id, year AS first_year, quantity, price
+FROM Sales
+WHERE (product_id, year) IN (SELECT product_id, MIN(year) 
+FROM Sales
+GROUP BY product_id);