Add promotional campaign evaluation

sql/promotional_campaign.sql

@@ -0,0 +1,11 @@
+select
+    C.FirstName,
+    C.LastName,
+    C.PhoneNumber,
+    C.EmailAddress,
+    max(O.BillAmount) as MaxBillAmount
+from Orders as O
+inner join Bookings as B on O.BookingID = B.BookingID
+inner join Customers as C on B.CustomerID = C.CustomerID
+group by C.CustomerID
+having MaxBillAmount > 60.00;