-- Add/modify columns 
alter table DELIVERYPOINT add SERVICEEMPLOYEE_ID number;
alter table DELIVERYPOINT add SALESAREA_ID number;
-- Create/Recreate primary, unique and foreign key constraints 
alter table DELIVERYPOINT
  add constraint FK_DELIVERYPOINT_SERVICEMPLOYE foreign key (SERVICEEMPLOYEE_ID)
  references EMPLOYEE (EMPLOYEE_ID) on delete set null;
alter table DELIVERYPOINT
  add constraint FK_DELIVERYPOINT_SALESAREA foreign key (SALESAREA_ID)
  references SALESAREA (SALESAREA_ID) on delete set null;
