Sql count not adding up correctly

I'm having a problem trying to get an accurate count of my records being
updated.

Here is the SQL statement for the update:

Exec Sql
Update CaRates as a
Set a.Term = :xTermDate
Where exists
(select * from xtCaRates as b
where a.ptccp7 = b.ptccp7 and
a.ptccp6 = b.ptccp6 and
a.ptccp5 = b.ptccp5 and
a.ptccp4 = b.ptccp4 and
a.ptccp3 = b.ptccp3 and
a.ptcpp2 = b.ptccp2 and
a.ptcpp1 = b.ptcpp1 and
(a.Term = 0 or a.Term > :xDate));

The update seems to work just fine, but I'm trying to validate the results
and this statement always seems to give me more records than I have:

SELECT count(*)
FROM CaRates a, xtCaRates b WHERE a.ptccp7 = b.ptccp7
and a.ptccp6 = b.ptccp6 and a.ptccp5 = b.ptccp5 and a.ptccp4 =
b.ptccp4 and a.ptccp3 = b.ptccp3 and a.ptccp2 = b.ptccp2 and
a.ptccp1 = b.ptccp1
and (a.Term= 0 or a.Term > 20121214 and
a.Term <> 20121231)

Any help or suggestion would be greatly appreciated.