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Access 2K2: making numbers up in a query sum



 
 
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  #1  
Old May 27th, 2010, 09:45 PM posted to microsoft.public.access.queries
The Dude
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Posts: 30
Default Access 2K2: making numbers up in a query sum

Hi all!

I am running a query in a subform where I sum a [number of units] *
[operation sign]. Units are imported from a csv file with 3 decimals and
operation sign is either -1 or +1:
For example, [440.000*-1] + [550.070*+1]... etc...

For a strange reason, Access shows 7 to 9 decimals in the sum's result. Now
they are not zeros and it seems like it's calculating on something but I
can't figure what!
The problem is that the result is wrong, and the only way I can get a good
result is by formating like "#,##0.000" the product of the two.

This is just insane and I can't understand why it would do that...

Any thougts?
Thx
T_D
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  #2  
Old May 28th, 2010, 04:46 PM posted to microsoft.public.access.queries
John Spencer
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Posts: 7,815
Default Access 2K2: making numbers up in a query sum

Floating point numbers can act like that. The problem is that the fractional
portion of a number often cannot be accurately represented. For instance, in
a base 10 system there is no way to completely resolve 1/3. Similiarly, in a
binary system there are fractions that cannot be fully resolved. Now throw in
the complication of converting between the two systems - binary and decimal
and fractional portions of numbers introduce slight differences.

Since you are accurate to 3 decimal points try using CCur to cast the results
into the special fixed decimal (4 places after the decimal) that currency
represents.

CCUR([Number of Units]) * CCur([Operation Sign])

John Spencer
Access MVP 2002-2005, 2007-2010
The Hilltop Institute
University of Maryland Baltimore County

The Dude wrote:
Hi all!

I am running a query in a subform where I sum a [number of units] *
[operation sign]. Units are imported from a csv file with 3 decimals and
operation sign is either -1 or +1:
For example, [440.000*-1] + [550.070*+1]... etc...

For a strange reason, Access shows 7 to 9 decimals in the sum's result. Now
they are not zeros and it seems like it's calculating on something but I
can't figure what!
The problem is that the result is wrong, and the only way I can get a good
result is by formating like "#,##0.000" the product of the two.

This is just insane and I can't understand why it would do that...

Any thougts?
Thx
T_D

 




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