Add Part 1 DROPs

Cruise.sql

@@ -1,3 +1,16 @@
+-- Part 1; add drops so that we can keep re-running this file.
+DROP TABLE Reservation;
+DROP TABLE TravelAgent;
+DROP TABLE Cruise;
+DROP TABLE Company;
+DROP TABLE Customer;
+DROP SEQUENCE customerID_seq;
+DROP SEQUENCE cruiseID_seq;
+DROP SEQUENCE travelAgentID_seq;
+DROP SEQUENCE reservationID_seq;
+
+-- Part 2; Set up schema and insert data.
+
 CREATE TABLE Customer(
 	customerID NUMBER,
 	firstName VARCHAR2(15),