From 1108d9cf881172d0fa87f27f0aced8ddc39a0f96 Mon Sep 17 00:00:00 2001
From: Zaid Roshan Mayers <zaidmayers@gmail.com>
Date: Wed, 22 Jan 2025 19:15:42 -0500
Subject: [PATCH] Added solutions for Customers Who Bought All Products and
 Product Sales Analysis III

---
 CustomersWhoBoughtAllProducts.sql | 4 ++++
 ProductSalesAnalysis3.sql         | 3 +++
 2 files changed, 7 insertions(+)
 create mode 100644 CustomersWhoBoughtAllProducts.sql
 create mode 100644 ProductSalesAnalysis3.sql

diff --git a/CustomersWhoBoughtAllProducts.sql b/CustomersWhoBoughtAllProducts.sql
new file mode 100644
index 0000000..f894df3
--- /dev/null
+++ b/CustomersWhoBoughtAllProducts.sql
@@ -0,0 +1,4 @@
+SELECT customer_id
+FROM Customer
+GROUP BY customer_id
+HAVING COUNT(DISTINCT product_key) = (SELECT COUNT(*) FROM Product);
diff --git a/ProductSalesAnalysis3.sql b/ProductSalesAnalysis3.sql
new file mode 100644
index 0000000..ea6ffb5
--- /dev/null
+++ b/ProductSalesAnalysis3.sql
@@ -0,0 +1,3 @@
+WITH FirstYear AS (SELECT product_id, MIN(year) AS first_year FROM Sales GROUP BY product_id) 
+SELECT s.product_id, f.first_year, s.quantity, s.price 
+FROM Sales s JOIN FirstYear f ON s.product_id = f.product_id AND s.year = f.first_year;
\ No newline at end of file