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Generate calculated value in text box using two inputs (excel function)

Hello,

I am currently in the process of switching some of our daily functions at the office from separate excel spreadsheets into a single Access database. So far I have this setup in form ("Contracts"):

Field A: total annual usage (kWh)
Field B: broker fee ($/kWh)
Field C: Anticipated Revenue (field A x field B)

Is there any way to have Field C automatically calculate when A & B are entered? The form is linked to a table. I've read a few different theories online but nothing seems straightforward, and if at all possible I would like to do it without manually running a query. Sorry if its a stupid question, I'm still learning Access - but this site had helped out immensely!

Any help would be greatly appreciated!
Oct 6 '10 #1

✓ answered by dsatino

set field c's control source to:

=[fielda]*[fieldb]

15 2829
dsatino
393 256MB
set field c's control source to:

=[fielda]*[fieldb]
Oct 6 '10 #2
Wow thank you so much! Can't believe it was that simple...worked like a charm! Thanks Again!
Oct 6 '10 #3
dsatino
393 256MB
No problem.
Just for clarification. The value being displayed is only being displayed, not written anywhere.
Oct 6 '10 #4
hmmmmm... is there anyway to store that data in the table that the field is linked to? If that's not possible I guess my only other concern would be whether or not I would be able to run a query that can total those amounts from all of the forms. Any thoughts?
Oct 6 '10 #5
dsatino
393 256MB
As background info, by changing the fields control source you've 'unlinked' that form field from the table. This only affects this one field.

In general, you usually don't need to store values that can be derived as in this case.

If you need a way to view the total from all of the records behind the form, then you just need a query with a field that is:

[fielda]*[fieldb]

It would look something like this:

SELECT ([fielda]*[fieldb]) as AntRev
FROM yoursourcetable

Obviously you'll have to change the table and field references to match your table, but that should do it.
Oct 6 '10 #6
Awesome, got that to work as well. Thanks again.

As a side question, what in your opinion would be the best way to view the sum of the AntRev column? Would this be possible on a report?
Oct 6 '10 #7
dsatino
393 256MB
If you named you last query 'Query1'

Expand|Select|Wrap|Line Numbers
  1. SELECT Sum([AntRev])
  2. From Query1
Then you can set the control source of a report field to this new query field.

If you don't actually need to print it out, you can simply add a field in your form footer with a control source of:

Expand|Select|Wrap|Line Numbers
  1. =DSUM("[AntRev]","YourTableName")
Oct 6 '10 #8
Wow, thank again! Worked just as described. However I do have (hopefully) one last question -

Another column in the table is for Sales Rep, which is a simple combo box linked to a table with the sales rep's names as separate records. I would like to be able to have a criteria of sorts that would show me the sum of the AntRev, but only for a specific sales rep. I tried to put a parameter on the sum query you just laid out for me but it gave an error saying I was trying to execute a function that includes a field that is not part of the aggregate function.

I don't even know where to begin to put that one together. Again you've been a huge help and your responses are greatly appreciated. This site is truly amazing...
Oct 6 '10 #9
dsatino
393 256MB
If somewhere in the table with the revenue data, there is a field with some sort of reference to the agent then it's simply a matter of adding the agent table to the original query and joining them on the related fields.
Oct 6 '10 #10
I'm not quite sure what you mean by "joining them on the related fields"... I have attached a photo of the original AntRev query (not the sum query) in design view with how it is currently set up. (Although the Rep table is showing at the top none of the fields have been added to the query.)

Oct 6 '10 #11
dsatino
393 256MB
Ok, you have them joined. Just add the RepName field from either one of the tables in the query. In the 'criteria' line of the RepName field, add [Enter RepName]

Every time you run the query, it will ask you for the rep name
Oct 7 '10 #12
Thanks, I can get that to work for the AntRev query...however when I try and apply the same method to the

SELECT Sum([AnticipatedRevenue]) AS [Total Revenue]
FROM AntRevQuery;

it gives me the error message I mentioned. I can't even think of the schematics of how it would be laid out because the sum query only returns a single cell with the amount in it, but like I said I'm an amateur

. Thanks again for the replies!
Oct 7 '10 #13
dsatino
393 256MB
It shouldn't error. If the sum query is based on the AntRev query then then sum query should also ask you for the agent
Oct 7 '10 #14
Wow, unreal...works like a charm. Thank you so much, you have no idea how much you've helped. Awesome!!
Oct 7 '10 #15
dsatino
393 256MB
I just looked at the picture you sent. You need to ask for the name in the AntRev Query only. You can take the contracts and Rep table out of the sum query all together.

When you build a query on top of another query with a parameter prompt, you will still be asked for the parameter because the query on top can't return results until the lower level query parameter is input.
Oct 7 '10 #16

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