diff --git a/Customers who bought all the products.sql b/Customers who bought all the products.sql
new file mode 100644
index 0000000..bf7b46d
--- /dev/null
+++ b/Customers who bought all the products.sql	
@@ -0,0 +1 @@
+SELECT customer_id FROM Customer GROUP BY customer_id HAVING COUNT(DISTINCT product_key) = (SELECT COUNT(DISTINCT product_key) AS 'num_product_key' FROM product)
\ No newline at end of file
diff --git a/Product Sales Analysis III.sql b/Product Sales Analysis III.sql
new file mode 100644
index 0000000..18f5ef2
--- /dev/null
+++ b/Product Sales Analysis III.sql	
@@ -0,0 +1 @@
+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) 
\ No newline at end of file