Here's an example from Tom Kyte: http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:503512000346581816 Regards, Brandon From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Lei Zeng The implicit data type conversion Would you provide a testing case on this? ________________________________ Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it.