Delete all data from the database

1. Run this script:
SELECT 'DELETE FROM ' + name FROM sysobjects WHERE type = 'U'

2. Copy the result in the query window; then, execute
DELETE FROM tblAccommodationProductFacilityCategory
DELETE FROM tblProductClass
DELETE FROM tblVehicleDriveType
DELETE FROM tblCommunicationType
DELETE FROM tblAccommodationProductFacility
DELETE FROM tblVehicleRadioType
DELETE FROM tblAccommodationProductFacilityDescription
DELETE FROM tblVehicleType
...

3. Repeat over and over again until there is no error remaining