title: Best way to export delta data of a transactional table
body: <p>Following is the requirement for my table say "Orders":
  1) On day-1, I am sending the full data using bcp command as a unicode text file.
  2) From the next day daily, I need to send only delta data for the transactions happenned that day.
  What is the best way to implement delta? I would like to avoid the current table design and not all table has timestamp fields.</p>