diff --git a/Customers Who Bought All Products b/Customers Who Bought All Products
new file mode 100644
index 0000000..48137fd
--- /dev/null
+++ b/Customers Who Bought All Products	
@@ -0,0 +1,2 @@
+
+select distinct(c.customer_id) from customer c right join product p on c.product_key=p.product_key group by c.customer_id having count( distinct p.product_key) = (select count(distinct(product_key)) from product)
diff --git a/Sales Analysis III b/Sales Analysis III
new file mode 100644
index 0000000..d09806d
--- /dev/null
+++ b/Sales Analysis III	
@@ -0,0 +1,16 @@
+WITH cte AS (
+    SELECT 
+        product_id, 
+        year, 
+        quantity, 
+        price,
+        RANK() OVER (PARTITION BY product_id ORDER BY year ASC) AS rnk
+    FROM Sales
+)
+SELECT 
+    product_id, 
+    year AS first_year, 
+    quantity, 
+    price
+FROM cte
+WHERE rnk = 1;