update query

  • Thread starter Thread starter peljo via AccessMonster.com
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peljo via AccessMonster.com

I want to build a query that updates the field branch4 to the field items4
and the sum obtained to divide to the field pack.My query cannot update can
you help ?
Here is my query :
UPDATE products1 SET products1.branch4 = [products1].[items4]/[products1].
[pack];
 
Peljo,
What error messsage did you get when you tried to run the query?
For a debugging test, change your query to a select query and open it in
datasheet view.
See if it returns any records.
Things to check:
--any unique indexes on the field being updated
--the data type of the field being updated and the data doing the update


Jeanette Cunningham
 
I want to build a query that updates the field branch4 to the field items4
and the sum obtained to divide to the field pack.My query cannot update can
you help ?
Here is my query :
UPDATE products1 SET products1.branch4 = [products1].[items4]/[products1].
[pack];
Click to expand...

Storing derived data such as this in your table accomplishes
three things: it wastes disk space; it wastes time (almost
any calculation will be MUCH faster than a disk fetch); and
most importantly, it risks data corruption. If one of the
underlying fields is subsequently edited, you will have data
in your table WHICH IS WRONG, and no automatic way to detect
that fact.

Just redo the calculation whenever you need it, either as a
calculated field in a Query or just as you're now doing it -
in the control source of a Form or a Report textbox.

John W. Vinson [MVP]
 
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