SQL Mystery : Bug in latest SQO32_73.DLL?

Running Oracle 7.3 Workgroup for NT Server.

MyTable T has these columns:

ID	VARCHAR2(3)
AGENT	VARCHAR2(5)

select * from MyTable T
where T.ID = '059'
and T.AGENT = '1111'

returns null set. BUT

select * from MyTable T
where T.ID = '059'
and T.AGENT = 1111

returns many rows.

Am I missing something very simple? Both columns are VARCHAR2.
Query executed from SQL Plus 3.3. Query also executed from TOAD.
Query also executed from MS-Access via ODBC. All three tools yield identical results.

The only thing that has changed on our system was the installation today of Oracle's latest ODBC driver for 32-bit Windows, and the existing SQO32_73.DLL file was replaced as part of the installation.

TIA,
Tim Received on Tue May 05 1998 - 17:09:33 CDT