diff --git a/customers_who_bought.sql b/customers_who_bought.sql
new file mode 100644
index 0000000..590ef9f
--- /dev/null
+++ b/customers_who_bought.sql
@@ -0,0 +1,2 @@
+select customer_id from customer group by customer_id having count (distinct
+product_key) = (select count(product_key) FROM product);
\ No newline at end of file
diff --git a/product_sales_analysis.sql b/product_sales_analysis.sql
new file mode 100644
index 0000000..4104ebd
--- /dev/null
+++ b/product_sales_analysis.sql
@@ -0,0 +1,3 @@
+select product_id, year as first_year, quanitity, price from sales where
+(product_id, year) in (select product_id, min year) as year from sales
+GROUP BY product_id;
\ No newline at end of file