Wow. That would be a problem, but why are you looking in the TCD table?
Are you looking for "abandoned ringing" for a call that reaches the desktop but which the agent doesn't answer?
If you are looking for a call that abandons in queue, look in the Route_Call_Detail table for rows with RouterErrorCode = 448 and check RouterQueueTime for the amount of time between the route request and the customer drop.
Regards,
Geoff