Help with validation rule

[Electricsuit]

I have a database that I use to track odometre readings. Several
vehicles are tracked. As you can imagine, if the wrong vehicle is
entered for the given mileage, it will through off reporting. I would
like to include some kind of validation or error checking.

1) Display or check against the last entered record for the vehicle
(by DATE).

2) Then doesn't allow the new entry to be less than the last one or
500 km more than the last one.

I'm by no means an expert with Access.

Magic

[Tom van Stiphout]

On 11 Mar 2005 05:42:46 -0800, el**********@yahoo.com (Electricsuit)
wrote:

This is somewhat hard to do in a validation expression, but you can
write some code in the Form_BeforeUpdate event.
You can use DMax function to get the max odometer reading for that
vehicle.
If you have lots (>10,000) of rows, a parameter query may be much more
efficient, but requires more skills on your part.

-Tom.

I have a database that I use to track odometre readings. Several
vehicles are tracked. As you can imagine, if the wrong vehicle is
entered for the given mileage, it will through off reporting. I would
like to include some kind of validation or error checking.

1) Display or check against the last entered record for the vehicle
(by DATE).

2) Then doesn't allow the new entry to be less than the last one or
500 km more than the last one.

I'm by no means an expert with Access.

Magic

[Trevor Best]

Tom van Stiphout wrote:

On 11 Mar 2005 05:42:46 -0800, el**********@yahoo.com (Electricsuit)
wrote:

This is somewhat hard to do in a validation expression, but you can
write some code in the Form_BeforeUpdate event.
You can use DMax function to get the max odometer reading for that
vehicle.
If you have lots (>10,000) of rows, a parameter query may be much more
efficient, but requires more skills on your part.

Then add some more code when the vehicle has its engine replaced :-)

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