Math Operations On Values Question

May 13, 2005

I have created a table that holds the inventory information of some items i have in stock. What I want to do is this:

1.)When a customer orders something, i enter the quantity ordered and hit a process button. When this button is clicked it automatically reduces my inventory count to reflect the reduction

2.)When I receive shipments, i want to enter the information and hit process so that it automatically sets my inventory counts to reflect the addition of the new units

I am having trouble figuring out how to go about doing this. I was thinking of somehow setting up some textfields and then adding buttons that set fields accordingly.

Any help would be most appreciated.

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Forms :: Linking Form Operations To Values In A Field

Sep 8, 2014

I have a combo box field called "investigations" on a patient database which can allow multiple values. Each of its values represent the different investigations a patient can do. Now those investigations are tables and forms in the database. how can i program the database to simultaneously open these forms "on update" of that field-investigations?

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Dealing With Null Values In Math Expressions

May 11, 2006

Hi all,

I am in desperate need of some advice. Today I set to work building some math functions in my queries to calculate delays/turnaround times for work, etc.

I have found that where there are null values in my table - the calculation seems to break down.

Let me explain...

In it's simplest form (I have removed some fields and will deal with DATE only, not TIME which is a seperate field) I have the following -


I have the following expressions in my query -

Turnaround: Date_Completed - Date_Received
TimePended: Date_Recommenced - Date_Pended
TimeInactive: Date_Started - Date_Received
Workrate: Turnaround - (TimePended + TimeInactive)

The query calculation will only work when all fields contain a value.

For instance, sometimes the work may be started, then completed. Skipping the 'Pended' and 'Recommenced' steps.

Can anyone tell me what I need to include in my maths for Access to treat a null value in the table as zero? Or any other approach.

Please help!!!!!


Rob :eek:

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Bitwise Operations?

Nov 10, 2006

Do queries support bitwise operations:


2048+512+128 = 2688

Field1 = 2688 in the table

MyField: ([Field1] And 512) = 512


Jaeden "Sifo Dyas" al'Raec Ruiner

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Date Operations

Aug 13, 2007

Hello everyone,

I need help in writing a query that would return the records that are not older than two weeks.
I would appreciate your help in advance. :o

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Using Operations Between Tables

Sep 25, 2011

I have 3 tables in my database.

How can i use oprations between my tables?

For example: I have 3 tables named "Input,Output and Available"

When I add for example "2 Hard-Disks" in Output, 2 of Hard-Disks deletes from Available Automatically....

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Operations Must Use Updatable Query?

May 23, 2005

Please help, this error is wreking my head:
I have a VB APP updating a an Access DB, i get this error every so ofter:

-214 (load of numbers) Operation must use an updatable query.

I have given full control to to the directory on which the App and the Access sit..
any ideas?

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Math Help

Aug 21, 2006

I have an artwork book which I am cataloging. Each page of the book contains 24 pices of artwork.
What I need to do is display a page number to whatever record number I enter into the field.

Example 2: I enter any record number from 1140 and the field will display 48 for the page the artwork is on in the book.

Example 2: I enter any record number from 1153 and the field will display 49 for the page the artwork is on in the book.

Example 3: I enter any record number from 457 to 480 and the field will display 20 for the page the artwork is on in the book.

Thanks for any help I can get on this

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Best Way To Do The Math

Nov 10, 2004

I am a wiz at formulas in excel but am not sure yet how to make them work in access. I have a main form into which I put the date recieved of many items for each facility. Next to each of the dates I have entered I want to have a non inputable text block that will look at the date then do the necassary math automatically. Some of the formulas will also contain conditional statements based off of a date, type and rating. Can anyone suggest the best way to do this or point me toward a resource that explains how to use formulas in access. Here are a few examples of the formulas that are already in place in the excel version.

=IF(I28="Unsatisfactory",C28+60,(IF(F2="AA&E",C28+365,(IF(F2="Major Funds",C28+365,C28+1470)))))
in the above formula C28 is a date entered by the user, otherwise most formulas I need to input are simply (date + 1 year or date + 4 years)

Any advice would be greatly appreciated.

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Math Funtions

Jul 20, 2007

What the best way to perform math functions on data in a table? I have a form and a subdatasheet in it. I want to be able to: Average out data in cells. I.E One field will have a list of numbers and I want to be able to average those out.

The other is that i want to be able to check the previous cell(year) and see if the number has gone up or down?

Many Thanks :)

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Failed Math Can't Add

Dec 4, 2004

I have 6 fields that display a price based on a combo box selection
I can get one to subtract from another but not all add up
It should also be a running total so it updates as I pick more options

And how can you get the combo baxes to start out blank they all have
selects already made when I open the form

Thanks I'm fairly new to access

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Queries :: Checking Query For Null And Setting Operations

May 30, 2014

I have been working on an application where I am collecting survey data in a database. There are multiple survey tools available to the user, and it's possible to complete multiple survey tools in the survey.My problem is, it's possible for the surveyor to complete some tools on one day and other tools on another day. I am having problems with trying to figure out how to add a tool that has not been previously added and keep in the same survey which is all held under a single Survey Number.

The first step in the function is to set a Record Number temporary variable based on whether or not the tool has been used (it's possible to use multiple instances of a survey tool, so need to know if the Record Number is '1', or the next number in the sequence.I've been trying to do this by checking a query for a Null and setting the temporary variable using something like:

IF ISNull("RecordNumber","qryRecordHeader") Then '1'
DLast("RecordNumber","qryRecordHeader") +1
End IF

The second half works just fine, so if there is a previous record, it will add. But if it's Null, it doesn't work.I'm trying to avoid opening a temporary form to run the query and checking a field. Is there a way around that?

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General :: All Operations Based Off Of Newly Entered Date

Apr 30, 2013

I am looking to (on the mainform) have the user enter into a text box whatever date they would like to enter and have that value become the current date of the system. So that all operations are based off of this newly entered date.

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Query Math With Dates

Aug 18, 2006

I want to have a query that will subtract a Due Date from todays date and tell me how many days are left/passed in either a positive number or negative just like the DateDiff Function. how do i do this?

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Failed Math Update

Dec 5, 2004

Its in the control source of the text box I want the total stored in
=Forms![Estimate Maker]!Tank.column(2)+Deck.column(2)+[Internal Valve].column(2)

The data entry setting did the job thanks much

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Forms :: How To Do Math With Two Different Units Of Measure

Oct 30, 2013

I have a table with some prices that are charged by the pound and some that are charged by each.

ID 1 - 1.00 per pound
ID 2 - 1.50 per pound
ID 3 - 2.00 per pound
ID 4 - 5.00 each
ID 5 - 7.00 each

My form is set up so that way I count how many containers I have and their weight, separately. I need ID 1 through 3 to do the math based on the pounds (essentially $1 per pound at 36 pounds) and ID 4 and 5 to do math based on how many of each are there ($5 each, and there are 3 of them).

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Help A Newbie Understand Simple Math Functions

Aug 6, 2006

I am completely new to Access but probably all I will need is a gentle push in the right direction. I'd like to think I'm fairly quick at learning new things. Thank you in advance, here's where I am, (first step anyway):

Table 01 Parts List
ID - name - cost

Table 02 Item List
ID - nick name - description

Table 03 Items to parts relationship (this is where I fall apart)
ID - Item ID (relationship to table 02) - Item nickname - PartID (relationship to Table 01) - Part name - Part quantity.

What I am trying to do:
I resell items in table 02 which are built of various parts from table 01. I need to generate a table that says:
Item 1 is built from 4 of part 1, 2 of part 2, 9 of part 3, and the total cost of parts for Item 1 is x. I want to update the parts list cost on a regular basis and have the item price change reflected.

If I can understand how to make this work, I can ultimately add in labor and overhead etc etc. Baby steps for now.

Thanks again

Here's a copy of my sad little db

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Forms :: Performing Basic Math On A Specific Column / Row

Oct 10, 2014

how to do anything with it outside of tables and queries. I have been tasked with creating a form to do fairly basic things. Via tutorials I have managed to use the Expression Builder to do virtually everything I need except one thing.

I need to pull a value from row 2 in a specific column from a subform and subtract it from row 1 in the same column and subform leaving behind a + or - number for the user. Similarly, I need to do the same but subtracting the LAST ROW from row 1. If there is only one row at the time the operation is being performed, a value of No Data needs to be returned instead of a number.

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Reports :: Report In Which A Textbox Generates Numerical Values And Letter Values

Aug 6, 2014

I have a report in which a textbox generates numerical values and letter values. I want to...On report load - if textbox = numbers then hide otherwise show if it contains letter values.

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Queries :: Calculation Based On Values Selected In Table By Looking Up Corresponding Values In Other Tables

Aug 29, 2014

I'm using Access 2010. I need to calculate a score based on values selected in a table by looking up corresponding values in other tables. I have a "Project" form to create new entries into the Project table (see Table 1). When I create a new project record, I will select values for the Payback and Need fields by selecting options from a list. The Payback list is pointed at Table 2 and the Need list is pointed at Table 3. In the below example, I created the "ABC" project and selected "1 year" for the Payback field and "Repair" for the Need field. Pretty simple.

Now that I have the "ABC" project loaded to my Project table, I'd like to create a report that will show a "score" for this project. The score should be calculated as follows: Payback Impact + Need Impact. In this example, the score should be 30 (Payback Impact of 20 + Need Impact of 10).

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Modules & VBA :: Get Number Of Unique Values Without Separating Values That Belong To Same Block?

Dec 5, 2014

I have the following dataset in a table called NR_PVO_120. How do i pick out a number (which can change but let's say, 6) of UNIQUE OtherIDs without excluding any OtherIDs under any fax numbers?

So, if you pick OtherID from Row7 you then also must pick OtherIDs from rows 8 and 9 because they have the same fax number. Basically, once you pick an OtherID you're then obligated to pick all OtherIDs that have the same fax number as the one you picked.

If the number requested (6 for this example) isn't possible then "the closest number possible but not exceeding" would be the rule.

For example, if you take OtherIDs from rows 1-10 you will get 6 unique OtherIDs but row 10 shares a fax with rows 11 and 12. You either need to take all 3 (but that will raise the unique count to 8, which isn't acceptable) or skip this OtherID and find one with a fax that has no other OtherIDs and that isn't on the result set already. My result of 6 UNIQUE OtherIDs will need to contain ALL OtherIDs under any fax the existing OtherIDs are connected to.

So one solution is to take rows 1-6, 26. Another is to take rows 1-4,10-14.

There will be many possibilities (the real dataset has tens of thousands of rows and the number of people requested will be around 10K), as long all OtherIDs connected to all faxes on the result set are part of the requested number (6 in this case) any combination would do.

A few notes.

1.Getting as close as possible to the requested number is a requirement.

2.Some OtherIDs will have a blank fax, they should only be included as a last resort (not enough OtherIDs for the requested number).

my table (NR_PVO_120)
Row OtherID Fax
1 11098554 2063504752
2 56200936 2080906666
3 11098554 7182160901
4 25138850 7182160901
5 56148974 7182232046
6 56530104 7182234134


A few sample outputs

one solution is taking rows 1-6 and 26.


Another solution is taking rows 1-4 and 10-14.


This is for a fax campaign, we need to make sure no fax number is faxed twice, that all people connected to that fax number are contacted under one fax sent.

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Forms :: Default Values Disappear If Put Values In Text Boxes

Sep 17, 2013

In Access 2010 I have a Data Entry Form on which I have an unbound textbox in the header that the user can put a default date in. In the body of the form is a bound textbox that records the date and the default value is set as =defaultdatestat (obviously the name of the box in the header).

Problem: The default date shows up perfectly until a value is put in any of the other text boxes.

For further info : If you put values in text boxes default value disappears; if you then push escape the default value reappears when the values in the text boxes disappear.

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Queries :: ORDER BY - Update Values In One Table With The Values In Another Using Join

Sep 18, 2013

I have a query with an INNER JOIN and ORDER BY that is working great. Now, using the same JOIN, I need to update values in one table with the values in another. I thought it would be simple until I learned you can't do an ORDER BY with an UPDATE. Is there another way to achieve the same result? If you remove the 'ORDER BY', the statement below doesn't produce an error but the results are not correct:

UPDATE TableA INNER JOIN TableB ON (Left(TableA.CDN,6))=(TableB.CDN)
SET TableA.HCC = TableB.HCC
WHERE TableB.HCC Like '241*' AND TableB.BBB = 'X' AND TableA.CCC = "1234" AND TableA.HCC IS NOT NULL

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Forms :: Allowing Different Values In One Field Depending On Selected Values Of Another

Nov 22, 2013

I have several result fields which are all drop down lists. I want each result field's drop down list values to be different depending on the selected value of the Test1 drop down list.I came up with using the .rowsource keyword. My syntax seems to be fine but I'm not getting any values under the result fields when I run the form.Here is my code so far:

Private Sub Test1_AfterUpdate()
If Me.Test1 = "Stress Echo" Or Me.Test1 = "Stress SPECT" Or Me.Test1 = "Stress PET" Or Me.Test1 = "Stress MRI" Then
Me.Test1Result2.RowSourceType = "Value List"
Me.Test1Result3.RowSourceType = "Value List"


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INNER JOIN Based On Equivalent Values, Instead Of Equal Values

Nov 3, 2005

I'd like to create a query which will consist of simple SELECT statements as follows:

SELECT [table1].[field1], [table2].[field1], [table2].[field2]
FROM table1 INNER JOIN table2 ON ([table1].[fieldX] = [table2].[fieldX]);

The challenge arises b/c instead of joining on equal values, such as the following:
[table1] INNER JOIN [table2] ON [table1].[field1] = [table2].[field1]

I would like to join based on equivalencies, such as:
[table1] INNER JOIN [table2] ON [table1].[field1] = 34 is equivalent to [table2].[field1] = 2;

I do not know the proper syntax, so this is where I need help. I tried to search online without any success.

I appreciate your help in advance.

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Queries :: Query Records With Both Duplicate Values And Different Values?

Jun 18, 2013

I'm trying to determine the SQL to return only those records in a table which have duplicate values in each of two fields, but different values in a third field. Here's an example:


AcctNum FoodType FoodClass
------- -------- ---------
A123 Apple Fruit
A123 Apple Fruit
A123 Grape Fruit
A456 Potato Vegetable
A456 Potato Perishable
A789 Carrot Vegetable
A001 Banana Fruit

For the above table, I'm trying to return records which have multiple entries for AcctNum + FoodType, but DIFFERENT values for FoodClass. So for the above table, the query would return:


AcctNum FoodType FoodClass
------- -------- ---------
A456 Potato Vegetable
A456 Potato Perishable

It returns these two records because there is more than one record with for the AcctNum + FoodType (i.e. 'A456' + 'Potato'), but DIFFERENT values for FoodClass (i.e. one record has 'Vegetable' while the other has 'Perishable').

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