Type Conversion Error

[Lou Early]

When attempting an update query as follows.

Field: ROW_Cost_Acre
Table: Greene_County_P roperty
Update To: [ROW_Actual_Cost]\[ROW_Acres]

I get a type conversion error. It calculates the correct value for some of them but the other get a type conversion error. This same query works fine in another database for another county with no problem.

The query is calculating the cost per acre from the total cost field and the total acres field and then placing it in the cost per acre field.

[gnawoncents]

Lou,

Do you have any zeroes or nulls in your values? Also, what data type are you using for the three fields in question?

[Lou Early]

There are no Null values and all three fields are formatted as numbers. There are 21 total rows and the query works properly and updates 15 of those rows but returns the error on the remaining 6.

[BRawn]

Hi Lou,

Could you perhaps post the query you're trying to execute?
It'll give us a good idea of what you're trying to do and we can try and help you from there...

[Lou Early]

Screen Shot

UPDATE Greene_County_P roperty SET Greene_County_P roperty.ROW_Cos t_Foot = [ROW_Actual_Cost]\[ROW_Length], Greene_County_P roperty.ROW_Cos t_Acre = [ROW_Actual_Cost]\[ROW_Acres]
WHERE ((([Greene_County_P roperty]![ROW_Aquired])="T" And ([Greene_County_P roperty]![ROW_Aquired])="T"));

[gnawoncents]

Kind of an odd question, but are any of your ROW_Acres 0.5 or less?

[gnawoncents]

One other thing, is there any reason you're using the back-slash (\) for division as opposed to the forward-slash (/) for division? I ask because everything might just work fine if you switch to the forward-slash.

[Lou Early]

Well that was dumb

Yeah. It was the \ instead of /. I cant believe I overlooked something so stupid. Sorry to waste everyone's time.

[OldBirdman]

When I first read this post, I noticed the integer divide "\" and assumed this was what was wanted, as Cost-per-Acre might very well be expressed as a whole number of dollars. A quick check of Access Help revealed that both handled Null and Empty fields the same, So I didn't see the solution.
gnawoncents' question "...are any of your ROW_Acres 0.5 or less?" is the key. Access rounds each numeric expression BEFORE dividing. So 0.5 is rounded to 0, and the divide fails.
Some quick testing reveals some quirks, so I now know to be very careful with this operand or NOT USE IT at all. In Immediate Window:

?5.7\2.2
 3
?INT(5.7/2.2)
 2
?FIX(5.7/2.2)
 2

?5.7\-2.2
 -3
?INT(5.7/-2.2)
 -3
?FIX(5.7/-2.2)
 -2