Add sales report scripts and results

sql/create_orders_view.sql

@@ -0,0 +1,15 @@
+-- sales report - task 1
+-- changes:
+--   interpreted quantity as the number of ordered items, because I assumed that Little lemon wants
+--   orders à la carte instead of fixed menus
+drop view if exists OrdersView;
+
+create view OrdersView as
+select
+    O.OrderID,
+    count(OI.MenuItemID) as Quantity,
+    O.BillAmount as Cost
+from Orders as O
+inner join OrderItems as OI on O.OrderID = OI.OrderID
+group by O.OrderID
+having Quantity > 2;