Creating Calculated Field With Two Expressions

Aug 6, 2007

Hi guys,

I am writing a select query and need an extra column which will be calculated using two tables.

The problem i am having is that i need to to say basically, return value A if value from table x < value from table y or return value B if value from table x > value from table y.

I tried using the HAVING clause but you cant use the if function with this it seems.

Your help is most appreciated.

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Feb 17, 2006

I have a query, and I want a field that shows the current balance as of that transaction, eg:__________________________________________________ _______|__Transaction ID__|__Type_______|__Amount__|__Balance__||__1______________|__Deposit_____|__£10______|__£1 0_______||__2______________|__Deposit_____|__£30______|__£4 0_______||__3______________|__Withdrawal__|__£15______|__£2 5_______|So far, I have this:SELECT [Transaction ID], [Type], [Amount], (SELECT Sum([Amount]) FROM tblTransactions AS tblTransactions2 WHERE tblTransactions2.[Transaction ID] <= tblTransactions.[Transaction ID]) AS BalanceFROM tblTransactionsWHERE [Account ID]=1;Although this does not look at the 'Type' field; it just adds the amounts; regardless of it being a deposit or withdrawal. I'm really not sure how to add this.Thanks in advance.

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I'm attempting to create a calculated field in a query called 'Test'. It's purpose is to determine if a certain field has a 'c' for closed and then returns the appropriate 3 months in a concatenated string. This previously worked when it was shorter. Now that I extended it for 2011 fields i'm getting an error that it is too long. I'm pasting the below code into the 'field' line of my query.

Code:
Test: IIf([DEC12_Status]="c",[OCT12_A] & " " & [NOV12_A] & " " & [DEC12_A]
,IIf([NOV12_Status]="c",[SEP12_A] & " " & [OCT12_A] & " " & [NOV12_A],
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[Code] .....

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No of weeks: DateDiff("ww",[charging period start],[dispatch date])

Any help appreciated thanks IW -- Cleveland. UK

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I am trying, and failing quite spectacularly to create a single query that will contain multiple expressions on the same field.

Please see attached jpg for example.

SQL: SELECT Count(StockData.status) AS FaultyPCs
FROM StockData
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But when I add one of these expressions to the next column in the builder, it seems to apply itself to the expression to it's left, causing that one to now give a result of 0.

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Does anyone know how to correct this? Thanks in advance.

:confused:

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Hi,
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Having been trying to do this for ages but having trouble with syntax.

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I am new to Access so please be gentle.

I heve started a new table and one of the fields is Date of Birth.

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Any ideas on how to make this work? does it have to be a querie?

Mant Thanks

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I am new to Access so please be gentle.

I heve started a new table and one of the fields is Date of Birth.

I want to have another field that looks at the data in DOB and calculate the age, I believe that this can be done with funtion datediff, but the layout doesnt look for other fields, it just looks for a date and the Now statement.

Any ideas on how to make this work? does it have to be a querie?

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Aug 11, 2005

I am new to Access so please be gentle.

I heve started a new table and one of the fields is Date of Birth.

I want to have another field that looks at the data in DOB and calculate the age, I believe that this can be done with funtion datediff, but the layout doesnt look for other fields, it just looks for a date and the Now statement.

Any ideas on how to make this work? does it have to be a querie?

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Apr 2, 2006

I have a table with customers, one with products and one transaction table. How can i produce a report, based on a query that will add up the total any one particular customer has spent to date from the transaction table?

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Apr 20, 2006

hi. i wanted to kno how to have a field in a table that is calculated from other fields if this is possible. for example i have a order table which has a quantity field and a price field and i want to add a total field that will alutomatically calculate the total (quantity*price) and add it to the field. i know how to do this in a query but don know how to get that field from the query into the table. thanks for any help

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Oct 26, 2006

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the same field in the table remainded empty

how can it be set so the table's field will get the clcaulation ?

** here is a sample file

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Oct 15, 2007

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Hello,
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I would like to put in an expression as source in a form
Text field based on the same table to AGGREGATE
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Feb 22, 2007

This seems a daft question but I have searched the forums and can't find an answer so I hope someone can help me.

I have a table: Register(RegID, Pupil, Activity, Duration, Preparation)

I have a query that I want to calculate the total hours the pupil has spent on activities.

The Duration and Preparation fileds are held as number of minutes so for a 1 hour event the number 60 is held.

I have a query with 4 fields:
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SumofDuration
SumofPreparation
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The problem I have is that TotalHours is calculating as an whole number.
e.g. I have a Record
Pupil = 701
SumofDuration = 270
SumofPreparation = 0
TotalHours = 4

But I want TotalHours = 4.5

I have set the Duration and Preparation field sizes to Decimal and Format to General Number.

I don't know what else to try.

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Mar 10, 2005

Can anyone tell me why this won't work? It calculates the 2nd argument (reduction_man) but not the first (reduction)

I have tried both of these and still can't get it to work.


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May 24, 2006

Hello Guys,

I am trying to do the following in a form.
1) (Travel hours + work hours) * dollarperhr to get the "Total" bill to a customer.

2) The results will be put in a field "TotalDollars" that is a part of a table.

Please help.

I tried to put an event (on change) on the "dollarperhr" box so that after entering the values in "travel hours" + "Work hours" * "dollarperhr", the calculation will be done to populate "TotalDollars", but it didn't work.

please help

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Dec 21, 2004

Hi here is my problem

I have a table named= Commun tasks
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I created from that table a form who shows these 3 fields. I also created in that form a calculated field (named Total) who shows the Total. I simply wrote
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I have another table (Project Information) who has 3 fields=[Prior total],[New Total],[cost addition]

What I need to do is each time the [Quantity] or the [Unit Cost] are changed, I need to show the [New total]. But also i need to show the [Prior total] which is based on the [Quantity] and [Unit Cost] before the change. So i think i need to store the calculated field (Total) in a table, but I don't really know how to do that (I,m a newbie).

Ok let's simplify my question

How can I store in a table a value from a Calculated field? I know that we should not store calculated value but in my case I need to store them.

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