Tables :: Storing Calculated Values?
Mar 7, 2014
I understand the conventional wisdom of not storing calculated values on the table, but I have a need to do do so. On my Input Screen I have a generated Certificate # derived from 5 single value fields keyed onto the screen. This certificate # is unique to those 5 single-value fields which should not be repeated. I want to store it on my Table as the Primary key with "no duplicates" so that if a keyer keys the same 5 single-digit values , thus creating the same Certificate #, he will get a MsgBox back telling him he cannot add a duplicate entry.
attached is my table and Input Screen.
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Jan 8, 2014
I know that as a general rule one should not store calculated values in a table, but if I need to include such a value on a number of forms, and calculating that value involves manipulating an ADO Recordset, does there come a point where the performance hit outweighs the design "quality"?
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Oct 14, 2005
I have been reading previous post s regarding the storing of calculated fields. Basically everybody says don't do it. However, if I don't I am not sure how to achieve what I need to achieve.
I am storing data on tool vibration levels. Data is input for X, Y and Z axes and a vector sum (total) is calculated on the fly using a query. So I only ever store X,Y and Z.
Ultimately I am looking for this database to be able to give me useful statistical outputs in particular a range of vector sums for a tool type. If I don't actually store the vector sum for each test then how I am ever going to report a range? The data would never change for each test as these become statictics, it's not the same as working out rates for example which may vary according to parameters.
What is the best way to do this?
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Aug 9, 2005
New to Access and learning the hard way. Im sure this is an easy one, but sure would appreciate the help. I am trying to sum a group of cells and display the total, which i have done. But I also want to store this total in my database. So my question is, how do i move my calculated total to my field that has the "record source" bound back to my field in the database? Hope that makes sense. Thanks in advance.
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Jan 3, 2006
if i have formula in a text box can that calculation be stored in a table???
example
sales total
sales tax
grand total
where grand total = sales tax+sales total
if the control is bounded to a field in a table once the formula is entered doesnt it loose the connection with the field???
right now when i enter a formula in a control it will no longer store it in the table but it will only show the result in the actual form..???
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Nov 5, 2004
Hi all, another beginner question here.
I have a table of records which is is basically temp storage, once I'm done inputing information, an append SQL statement is run to move the data to its permament table, then I use a delete statement to remove the values in the temp table.
Now, I have a column called Result, which stores the values of a radio button group (1, 2, or 3). I have a series of queries which count the number of times 1 or 2 appear (3 in this case, doesn't matter since it represents N/A. 1 = True, 2 = False, 0 = Null).
I'm having trouble getting the result of said query to store in a table. The statement is as follows:
SELECT [qryGetFail]![CountFail]+[qryGetPass]![CountPass] AS Total
FROM qryGetFail, qryGetPass;
This returns the sum of both counts, so I know how many questions were answered either Pass or Fail, hence I know how to score record. Here is my Append SQL statement as it currently works:
INSERT INTO tblAuditResults ( Question, Result, Comment, ACAPS, AuditDate, TeamMember, Auditor )
SELECT tblQuestions.Question, tblQuestions.Result, tblQuestions.Comment, [Forms]![frmAuditCreate]![txtACAPS] AS Expr1, [Forms]![frmAuditCreate]![txtAuditDate] AS Expr2, [Forms]![frmAuditCreate]![cmbTeamMember] AS Expr3, [Forms]![frmAuditCreate]![txtAuditor] AS Expr4
FROM tblQuestions
WHERE (((tblQuestions.Product)="4" Or (tblQuestions.Product)=[Forms]![frmAuditSelect]![txtVarProduct]) AND ((tblQuestions.Function)="3" Or (tblQuestions.Function)=[Forms]![frmAuditSelect]![txtVarFunction]));
This stores everything I need it to. But I cannot for the life of me get the statement to accept a value from a qeury and store it. I have tried adding another expression but it always just prompts for the value instead of pulling the value from the qryGetCalc.
Is there a specific way to have an INSERT statement pull a value off an active query?
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Mar 24, 2014
I have a table that stores information for multiple behavioral surveys (numerical values). My goal is to add the proper fields that compose total scores value for each respective survey (do a summation of scores). Now, under design view for my table, I see that I can add a calculated field. When I create this calculated field, I can use the Expression Builder to do a sum of the proper fields (the fields that compose a total score for a survey). The only problem that I'm encountering is that if a field that is part of a survey is missing information, the summation disregards the rest of the values for that survey.
How can I account for these missing values so that, if 1 out of my 9 fields have information, I will still get a summation score for the 9 fields? I want to be able to do this without having to change the value of the missing field to 0.
In SPSS I can easily do this by computing a variable and using a code like this:
SUM.2(field1, field2, field3, etc.)
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Apr 20, 2007
I know that it is bad form to store a calculated field in a table - normalization and all that - but I can see no other way around a need that I have.
I'm trying to make a database to store injury time for employees. If an employee is injured, he can do light work for a certain amount of time, but this light work need not be contiguous. But, the total time on light work must be known so as to see when it is used up.
For example:
Bob is injured on 4/1/06 and goes on light work on 4/2/06 until 4/5/06 (4 days). Bob is then taken off light work until 4/10/06 when he reinjures the same injury. This does not count as a new injury, because it is an aggravation of the old one. So, Bob goes back on light work on 4/10/06 until 4/15/06 (6 days).
So, I need to store Bob's total time on light work for this injury (10 days) so that I can keep a running total to check against the maximum for a single injury. All I can think of is to store the sum of days on light work as a field in Bob's injury record, but that means storing a calculated field in a table.
Am I missing an easy way to do this, or is there a method to do what I want that I am just not aware of?
Thanx for any help!
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Aug 10, 2007
Hi,
I know it breaks all the rules to store a calculated field on a table, but I've painted myself into a corner with the way I built this particular database, not good, I have repeating groups and basically the whole database is built this way. I need one form to store a calculated value on a table to solve a problem on a report that encapsulates the total of all the repeating groups. Before you start the lecture, I know I messed up, but this is way to far down the road to start over. Any help would be greatly appreciated.
Gary
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Aug 26, 2005
Hello All,
Probably trying to do the impossible.
Normally I would never (that’s a long time) have the results of a calculated field in a table, but I’m stumped.
Table1
TestID: Autonumber
Quantity: Number
Selected: Yes/No
Table2
SumID: Autonumber
TestID: Number, Foreign Key
Quantity Delivered: Number
Query1-Sum Query
Table2
TestID: Group
Quantity Delivered: Sum
Query2- Select Query
Record Sets
Query1 Table1
TestID-----------------------------------TestID
Quantity Deliverd Quantity
Select
Fields in Query2
TestID from Table1
Select from Table 1
Run Query
Can’t update “Select” field
So I’m thinking that I should create a 3rd query to update the summed Quantity Delivered into a new field in table 1. Which would in effect create a stored calculated field.
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Sep 16, 2013
I have a score marking template for an internal audit. A criteria is either met, or it is not. All of these questions have Yes/No data type. each question has a weighting. I have written a VBA function to work out the total score by using a bunch of If statements.I need to store the final result in a table, by entering the answers (yes or no) into a form.
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Jul 31, 2014
Currently I have a calculated field in my table; however, under certain circumstances I need to change the value to another value which is not related to the calculation. I understand that the calculated fields are read only (why is that?), so I was wondering if there was any way to change values within a calculated column without actually changing the expression itself.
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Aug 15, 2004
Here is an example of what I was talking about re: private message and storing calculated fields. Any help is much appreciated.
Also I received your email in regards to a sample secure database but I am getting a "Memory could not be read" error when I try to open it. Does this have anything to do with how it has been converted to 97 format or is it an error at my end? (I've been able to open other dbases from the forum).
Thanks,
Dearnne
PS Thanks also for your help with adding to option groups.
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Jul 5, 2015
Eventhough i know calculated control are for queries, I still need to store a calculated value of a sum. I have a form with customers, dates, locations. That form has a subform that contains the services done and materials used. This subform is in datasheet view. In the footer i have a control with =Sum([Price]).
So I need the value of this control to be stored in the table the main form is based on. I did an unbound control in the main form where the =Me!Subform.Form!.Textx will bring the value "over" Then for the on focus event the vba code Me.Total=Me.Textx stores the value. That is fine. The same works with a command button with the same vba code.
However i am asking if there is a more automatic way to get the value over without the unbound control/command button.
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Jul 26, 2012
I know that it isn't usually best practise to store calculated fields in a table, but in my situation it is necessary, and I haven't really found a good answer for this after searching these and other forums.
Currently my database has one "Name" field (I didn't make it like this) which might look like this "Jonathan (John) Smith"
Now I also have reason to grab the name like this "Smith, John" for other purposes.
I've set up a form for inputting new people with separate fields for firstname, preferredname, and lastname. I have the calculated fields:
=[fname] & " (" & [pname] & ") " & [lname]
=[lname] & ", " & [pname]
(Later I will add in all the iif's for if there is no preferred name)
Upon finishing the form, the user hits Submit, and I would like to store the concatenated values into the table in their appropriate fields.
I can do this with a SQL INSERT INTO statement but I'd have to add all 25 or so fields from the form, and injecting user input directly into a SQL statement is not best practice either.
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Aug 5, 2013
I am trying to create an accounting program on access and i got stuck on the final touches
I'll explain my situation in brief. I created two tables
/1 for the invoices (invoice number, client name, total)
/1 for the orders (order id, invoice number, subtotal)
And I made a relationship between those two and everything worked out well. I created a form/subform and put a text box in the subform to calculate the sum which worked correctly. And I exported the value of the sum to the main form and it's great.
The problem is that how can i make the Total field that belongs to the table invoice have a default value as same as the Expression (sum) so that the sum is stored with the invoice record.
i attached the picture in the attachments
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Mar 6, 2006
I have 3 values in unbound text boxes and a 4th text box that is calculating the sum of the first three text boxes, i need the result of the calculation to be stored in the field "Total Cost" that is also on this form.
Any ideas
Cheers Mikk
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Mar 10, 2006
Howdy
I know that you shouldn't store totals in Access, but I can't think of a way around what I want to achieve and wondered if anyone had any ideas.
An item on stock will move from one location to another, I will need to list the 'balances' of this stock at each location, easy enough to do, but there are hundreds of item movements per day and the users do not want a history of movements to be kept but do require an ongoing balance.
e.g.
100 of the item moves from A to B, this movement record gets deleted, how would I know that the item stock at A has been reduced by 100 and B raised by 100?
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May 13, 2015
I have what is probably a stupid question but I've been struggling with this one for a while. I have an ordering database which has an Orders table (containing Order ID, Date, Supplier etc) and an Order Line table within which I have a combo box for Product name, supplier, price, VAT rate, Line price etc. At the moment, I have the order line table as a subform within the Order form (run from the Orders table). The problem I'm having is the subtotal and total fields. At the moment these are in the Order Line table as I cannot figure out how to get these in the Orders table. In summary, can I make a calculated field in one table that calculates values from another table (linked by Order ID)?
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Jan 30, 2006
I am pretty new to access, I will get right to it.
I am scoring rating scales. I want to be able to enter just the responses from a person, say on 80 questions (preferably into a form), where all the answers are 0 to 3 and have Access add the questions into the right groups to calculate all the sub-scores of the rating scale.
For example, Scale A may consist of Questions 1, 6, 15, 29, 35, and 70
I need access to add those up and save them so I can use them in a report.
I also need access to add the frequency of certain questions that were responded to with the answer 3.
I have gotten Access to calculate the scores in a form by adding extra variables to the form, erasing the variable name out of the white box and putting in the syntax =[Q1]+[Q6]+[Q15], etc. in place of a variable name but it just sits there on the form and doesn't store it anywhere.
Thanks
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Aug 2, 2007
Hello,
I wanted to catch a little advice if I may be so bold. I have a HTML form with a series of checkbox values.
Code:<form method=post action=form-test.asp><input type=checkbox name=drinks value='cocal-cola'>cocal-cola<input type=checkbox name=drinks value='sprite'>sprite'<input type=checkbox name=drinks value='lucozade'>lucozade<input type=checkbox name=drinks value='oasis'>oasis<input type=submit value='Submit'></form>
Normally I would gather these up into an array using ASP and email the split up comma separated values out to the client via an email.
Code:drinks=Request("drinks")drinks_split=split(drinks,",")'email drinks to client
However, this time I need to store those values in an access database. I am assuming that the client may want to run queries on the different array values, for example, how may people chose coca cola and sprite.
Is it better to store the value separately - one Ms access field for coca cola, one for sprite (which is what I thought I would have to do to create queries on this) - or can they be stored under one field heading "drinks" and queries be performed on different values within that field?
Could someone explain a quick way of doing the latter i possible in MS access and the SQL for querying?
Cheers,
trufla
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Apr 29, 2014
In my database (attached), I need to be able to store multiple notes for tasks performed in various cities -- each note has a small description (more on that at the bottom of this post). For the "San Antonio, TX" task, notes "Heartbleed" and "BAT Scan" apply. From what I understand, this is a many-to-many relationship which will require the use of a junction box. My structure is like this:
tbTasks
TaskID (PK - autonumber)
Task
tbNotes
NotesID (PK - autonumber)
Notes
Details
jcttbTaskNotes
TaskID (FK from tbTasks)
NotesID ( FK from tbNotes)
My mainform (fmTasks) is based off the tbTasks table; my subform (subfmTaskNotes -- continous form) is based off the jcttbTaskNotes junction table. The Master/Child link for the subform control is TaskID. In the subform I have a combo box bound to the NotesID field in the junction table that allows me to choose a note.
My problem: I also have a "Details" text box in the subform that I want to be populated with the description of the Note selected in the combobox mentioned above. For example: if I choose the "Heartbleed" note, then I want that "Details" field to be populated with "Mitigate vulnerability associated with CVE-2014-0160". I assume it has to be somehow tied to the "Details" field of the tbNotes table, but how to implement that. How do I get the Details text box to display the details for each note?
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Jan 20, 2015
I am fairly new to using access and am currently creating a database for a small bakery. They have new legislation whereby they have to list all their product ingredients and any allergens in the ingredients must be shown in bold.
So far I have 3 tables as follows:
Products (*ProductID, ProductName, Photo)
Ingredients (*IngredientID, Ingredient, Allergen)
Product_Ingredients (ProductID, IngredientID)
I have 2 forms set up:
one to input ingredients and a checkbox if it is an allergen
The other has a main form and subform to get ProductName, Photo and then a combo box in the subform to add ingredients.
Everything appears to be working ok but I have an issue with my subform. The combo box has no duplicates and lists the ingredients in alphabetical order as I require. However, if I view the subform separately from the main form I see that it is storing all the ingredients selected for each product. Therefore it is storing a lot of duplicate information.
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Mar 19, 2005
I have been struggling with this and would appreciate any help. It sounds so simple!!! I have 4 fields (Unit Price 1, Unit Price 2, Unit Price 3, Unit Price 4) in a Orders table that I want to add together and store in a 5th field (Sub Total) in the same table using a form. I am having problems with the sum and I am unsure how to get it to show in the Sub Total box in the form as well as the table. Thanks for your help!!
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Dec 15, 2014
I'm looking into storing query data in temp tables for my reports run better. From what I'm reading, it seems best to have the temp tables in a separate db, and to break the links to avoid bloating of the FE database. I'm unsure how to do this with VBA, especially since my temp database will be password protected. When do I break the link - when I close the FE database?
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Oct 7, 2005
Hey there,
I want to store a "calculated" value from a form text-box. By calculated, i simply mean that it is a textbox that contains the following Data:
=[MemberFirstName] & [MemberLastName]
Basically, the field is the Members Username, the text box is called "Username" and it needs to be stored in "tblMemberInfo" under "MemberLogin" so that it can be used externally for the website.
The value is only going to be calculated automatically by the form once, and then it wont need to be changed again, which is why i want to store it in the db.
Any ideas on how i'd go about doing this?
Cheers
Fatmcgav
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