Data runs on a daily basis from different processes which insert the data into the table.Yes, it runs every morning as schedule. once it is insert into this table the 'IsSent' by default set the data to '0'. From there, it will pulls out from the table and write to a flat file. As it pulls out the field 'IsSent' set to '1'. So,I want only the data which set to 1 should pull out from the table.With that means, if there is data already pulled out before. I don't that to pull again with the new data.