Looks like your latitude and longitude arguments aren't syntaxed correctly.
Also I see you're referencing Zip Codes using a number syntax. Zip Codes
should be stored and used as if they were text, because some start with 0.
Try:
Distance(
DLookUp("latitude","ZIP_CODES","zip = '" & [Forms]![testform]![Combo4] &
"'"),
DLookUp("longitude","ZIP_CODES","zip = '" & [Forms]![testform]![Combo4] &
"'"),
[addresses]![LATITUDE],
[addresses]![LONGITUDE],
True)
AS Miles
"Peter Monica" <peter_monica@concentra.com> wrote in message
news:42fcba.0312041156.396defba@posting.google.com ...[color=blue]
> I am trying to calculate distance from a point entered by a user usng
> a function in Access in a query that calls tables in an Oracle
> database as well as in Access. I am getting the following message:
>
> Undefined function 'Distance' in expression.
>
> Here is the query:
>
> SELECT people.first_name
> , jobs.job
> , job_types.job_type_description
> , Distance(DLookUp("latitude","ZIP_CODES","zip = " &
> [Forms]![testform]![Combo4]),DLookUp("longitude","ZIP_CODES","zip = "
> &[/color]
[Forms]![testform]![Combo4]),[addresses]![LATITUDE],[addresses]![LONGITUDE],
True)[color=blue]
> AS Miles
> FROM (job_types INNER JOIN (people INNER JOIN jobs ON people.people_id
> = jobs.people_id) ON job_types.job_type = jobs.job_type) INNER JOIN
> addresses ON people.people_id = addresses.people_id
> WHERE (((specialty_mapping.panel_specialty)=[Forms]![testform]![Combo0]));
>
> OK, so the table names have been changed, but here's where each
> resides:
> people - Oracle
> jobs - Oracle
> addresses - Oracle
> job_types - Access
> zip_codes - Oracle
>
> Also, the function I am using (Distance) does work, and is a Public
> Function in the database.
>
> Any ideas?
>
> Thanks![/color]
Calling a function built in access in a query to Oracle through ODBC 
