>The only automatic to detect that a row was changed is with a timestamp. Sadly, the timestamp has nothing to do with dates and times. It's just a rolling number.
>

Hmmm... so, what if you inserted a record into the table and read the timestamp save it. Two days later, come back and update that record, read the timestamp... Then, all the records where timestamp between timestamp1 and timestamp2 would be the records that were already updated???

Isn't it just a binary number?

BOb