Tables And Calculated Values
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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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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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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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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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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Jul 8, 2007
hi I am making a late report of each employee's data and I calculated for each individual day by having late for how long, but I would like to make another column which displays the total amount of time late. This is currently what I have now:
http://i8.photobucket.com/albums/a45/janue/num1.jpg
My SQl looks like this:
SELECT username, DateValue(clocktime) AS Date_Clocked, Min(TimeValue(clocktime)) AS Clock_In_Time, ((Clock_In_Time-#9:00:00 AM#)*24) AS Late_By_inHours
FROM tablename
GROUP BY username, DateValue(clocktime)
HAVING Min(TimeValue(clocktime))>#9:00:00#;
clocktime is a date/time field, in reality it is regardless whether it is clock in or clock out time. And now I want my table to look smth like this:
http://i8.photobucket.com/albums/a45/janue/num2.jpg
Has anyone knows how to do smth like this? I tried using the SUM() but it states error stating it cant take the expression ((Clock_In_Time-#9:00:00 AM#)*24) smth lidat
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Aug 24, 2006
I have created two queries which calculates a total. I want to add the values of the two queries in a third query to give me a grand total.
When I try to create this third query, it gives me an error saying that the fields cannot be used from two different queries. So I'm just wondering whether this is possible or is there any other way of doing this.
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Feb 10, 2014
I have a textbox in a report that I would like to calculate the sum of values that are less than 600.Then have a second textbox that counts the number of records that have values less than 600..This is based off of a query with calculated fields..I have been working with a formula that looks something like this
=Sum(IIf([BaleETime]="<600",0))
But all I get is a value of 0.BaleETime is the elapsed time between bales.
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Apr 23, 2013
I am using calculated field as a data type in access 2010.
They are working fine.
However, I added a new field and now the final calc won't work.
I have Subtotal adding loads of fields together. Works fine.
Then I have a VATunit field which is a double integer, so enter 20 and my next field is VATTotal calculates the SubTotal + the VATunit by doing (Subtotal/100)*VATunit. This calculation is fine and gives me the correct amount.
The next field is a Total field. Which adds Subtotal and the VATTotal together. Howver, the Total is the same as Subtotal. It is not adding the VATTotal to it?
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Feb 3, 2006
Hi,
I have a field in a form which displays the Sum of 10 values from other textboxes. I want to display the values of that calaculated field in a report and somehow I am stuck. I am running the report based on a query.
How would I get those field calculation values to display in a report?
Thanks
dfuas
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Aug 28, 2006
I need to display a value from a table in a text field on a form based on another text field on the same form.
The table has records as follows:
Month/Year xx Month No xx Year No xx Month ID (xx shows break in columns)
Jan-06 xx 1 xx 2006 xx 24
Feb-06 xx 2 xx 2006 xx 25
Mar-06 xx 3 xx 2006 xx 26
Apr-06 xx 4 xx 2006 xx 27
May-06 xx 5 xx 2006 xx 28
Jun-06 xx 6 xx 2006 xx 29
Jul-06 xx 7 xx 2006 xx 30
In one text field I use the DateSerial function to calculate the value of the previous month (e.g.Jul-06). I need to return the MonthID value to the second text field based on the value stored against it is the table, so in case of Jul-06 it would show 30 in text field 2.
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Jul 20, 2015
I am trying to get a value from a textbox into a table I created...
The textbox "calculates a number based on which radio button is pressed example if radio button 1 is pressed it returns 0 if radio button two is pressed it returns 8 and if radio button 3 is pressed it returns 15." I need to save the 0,8, or 15 depending on which radio button is pressed into the table...
I know you aren't supposed to store calculated values into a table but the report would never need to be changed and it just saves a new one each time with that being said anyway to make this work would be very useful!
Also how can you use the answer of calculated textboxs in other calculations?
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Sep 17, 2013
I am trying to get calculated fields in my report to work but zero values in the data are throwing up #Div/0! and #Error! and #Num!
The main data fields I am trying to work with are:
VehicleReading
PreviousReading
VehicleLitres
My aim is to track mileage and consumption for a fleet of vehicles and show daily and weekly averages in mileage and consumption and then to flag 20% increase in consumption.
I have a calculated field in my report named Kilometers,
= [VehicleReading]-[PreviousReading]
And also a calculated field named Consumption,
=[Kilometers]/[VehicleLitres]
My sum and average calculation fields in the group footers are only working where there are values above zero in the Kilometer and VehicleLitres and Consumption fields.
In reality there are some days where there has been no travel, so some records will have a zero for the Kilometers field and there are also days when there has been no refueling so there is a zero for the VehicleLitres field.
I have tried using the expression builder to create an IIf function but to no avail. I have tried copying the syntax suggested by the Expression builder:
«Expr» IIf («expr». «truepart». «falsepart»)
However I keep getting error messages and despite troubleshooting and looking on the internet I can't seem to find a solution to this.
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Mar 17, 2014
i have a subform which contains a lot of calculated values. fields which calculate values are located both in master form and subform. i use those calculated values in various reports where i have to insert formulas again. so i have decided to insert calculated values in table directly. i can use update query but i am unsure how to trigger it; and how to keep fields updated everytime a value is changed.
main form fields = [gsm] , [rate]
sub form fields = [pages], [qty], [gsm]*[rate]*[pages]*[qty]
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May 29, 2014
I have two tables of data, each relating to three business branches (branches A, B and C).
Table 1 shows the expenditure of each branch (by fuel, premises and wages).
Table 2 shows a number of units for each branch (mileage, floorspace and sales).
What I would like to do is calculate unit costs, based on the expenditure in Table 1, divided by a relevant unit in Table 2. The catch is that I want to have a third table which allows the user to specify which expenditure (from Table 1) is combined with which unit (from Table 2) to generate the calculated unit costs. I've been able to do this in Excel, and have attached an example. I've also attached an incomplete Access version with the first two tables. Given the complexity of my actual data, I feel this could be better handled in Access than Excel.
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Jun 12, 2013
I have a query that performs some calculations, these calculations feed into another query and produce a final value. If there are no null values everything works perfectly. But when there are null values, I get errors.
What I have tried:
1) I tried to implement the Nz function for each field of the formula that is not calculated but from user input.
2) I tried to implement the Nz function for just the field that calculated the last result before feeding into the next query, but it didn't show the 0 value I gave.
3) I tried to use UPDATE TABLE SET in SQL, but I don't think I was using it right. I tried to use it for all records but always got an error when it ran.
The first two above result in showing no values at all, even if there are some. The third didn't work. How to easily update null values in the query to 0? All I could think of was to somehow use Criteria or SQL.
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Jan 27, 2015
So I have a report with the following text box controls:
[Surname] & ", " & [Firstname]
=Sum([Quarter1_A]) - Named "Quarter_Total"
=Sum([Quarter1_T]) - Named "Quarter_Target"
=Val([Quarter_Total])/Val([Quarter_Target]) - Named "%Target" (Percent Format)
The report is grouped by the expression '[Surname] & ", " & [Firstname]'.I am trying to sort the records by the %Target text box. I tried entering the expression into the sort function but it still sorts by the grouped expression. I also tried sorting by the name of the text box but got the same results. How can I sort by the desired control?
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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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Feb 7, 2014
i have one table in which ID is Primary ID with Different Values
Like
ID NAME PAN
1 A X
1 B Y
1 A X
2 C Z
2 C G
3 D U
it shows that ID 1 having 2 Name (A& B,with PAN, X & Y ,respectively).how can i get this that ID having More than 1 Value like 1 and how can i select only these records ID which having more than 1 value and how can i update values for 1 ID.
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Jul 15, 2015
I’m trying to create a function (by combining IFF with Dlookup) that will automatically complete the name off the Team Leader when the Agent Name is equal with the field from my table.So, I have a table called BAZA imported from Excel with the fields: Team Leader|Agent Name| Customer Number|Date of interaction|Reason of interaction|, and another table called Agents imported from Excel with the fields :Agent Name |Agent User . The User filed is the same with Agent Name from BAZA, but I also have in Agents table some Agents that are not in BAZA, that never had interactions with customers.I what to add another calculated field in Agents Table that contains the Team Leader of agent. Till now I tried this:
-create a query called Sort3 based on BAZA where i have Team Leader|Agent Name with no duplicates
-the function i tried is =IIf( “[Agent User] =”&[Sort3]![Agent Name], Dlookup(“Team Leader”, “Sort3″,”Agent Name=”&[Agent User], “Different Team Leader”) ….. it seems to have some errors
-the data type is text.I use 2010 version of Office.
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Sep 13, 2013
I've learned the hard way about using calculated fields in a table. I used on while building in Access 2010 for users that will be using Access 2007. Once my testers pointed out the error message, I did some research and realized my calculated field was the problem.
So, I created a query to replicate the calculation, deleted the offending field from the original table and redirected everything to point at the new query vice the original table.
However, my testers are still receiving the error about needing version 14 to access that table. There isn't a calculated field there any longer, but they still can't access that table. Did that calculated field put some sort of taint on my database that can't be removed? I'm not sure what to do. Do I need to start over, so that a calculated field was never part of the database to begin with? If so, how much of my existing one can I reuse?
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May 19, 2014
I have a table with columns as
1- Name
2-Marks in Subject 1
3-Marks in Subject 2
4-Marks in Subject 3
I want to create more columns in same table as
5-Total Obtained Marks
6-Maximum Marks
7-%age of Obtained Marks
How can I do it in one table
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Sep 27, 2012
I have three columns where A is a number, B is a number and I want to make C = to the greater of the two. i.e.
Col A = 10, Col B = 12 therefore Column C = Col B or Col A = 12, Col B = 10 therefore Col C = Col A
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Jul 22, 2013
Access 2013
I am trying to add some numbers together for a number of fields, of which at least one field will either be 0 or empty. I am trying to use the following formula in a calculated field in a table:
IIf(IsNull([Price Increase %]),[Total],([Total]*[Price Increase %])+Nz([LumpSumAnnualIncrease]))
Access returns an error statement: The expression XXX cannot be used in a calculated column.
Is there a different formula I should be using, or a work around, other than using the formula in a query.
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Feb 18, 2008
Hi,
I have two tables:
Table A provides total sales volume of the UK shoe market from 2000-2007.
Table B provides the sales volume of different shoe manufacturers from 2000-07.
I want a third table created, called Table C. This should look exactly like Table B but instead of sales volume it shows percentage sales that are calculated by using the figures in Table A and B (i.e. [sales volume from Table B/total sales volume from Table A] * 100).
Could someone point me in the right direction please (assuming that such a table can be created, based on a calculation of figures in other existing tables).
Thank you.
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