Best way to query on a non-table item?

Hi,
I have a form that has customer_name (non-table item) and customer_id (table item). Customer_id is not visible to the user. We need to be able to query on the customer_name. I have tried using the pre-query trigger but I get an error ORA-01422. Any suggestions would be appreciated. I am a non-technical person, so the simpler, the better.
Thanks in advance.
Trish

Hi ,
I know two alternatives:
1) Use the POST-QUERY trigger not the PRE-QUERY... But, you would have the same problem because i think that the customer_id column is not unique. So you should select a combination of columns which guarantee the uniqueness of the selected column...
2)Other design. Read the doc at :
http://www.oracle.com/technology/products/forms/pdf/BlockOnAJoin.pdf
Using this way you should not use the trigger POST-QUERY....
Regards,
Simon

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