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