I am trying to get "No of days late" in a particular table in MS access. I am trying to use calculated data type.
I have [ActualReturnDate] and [ReturnDate] in the same table (both are Date/Time) and I want to save difference between two columns in a calculated field.
I am using following expression:
DateDiff("d", [ActualReturnDate] , [ReturnDate] )
But no matter what i do I get error saying "The expression X cannot be used in a calculated column."
So does that mean I cannot use DateDiff in Calculated field? If not how should I do it?
You indeed can't do this in a calculated field.
Use a query instead, add a column and do the calculation in that column.
You can just add and substract dates.
Just use [ActualReturnDate] - [ReturnDate] as the expression to calculate the difference. If both fields are defined as date/time, the result should be the same, only include the time part as decimal.
If you want only whole days, you can wrap the result in Int()
Related
I want to get the current year and minus it from another year and have the result be an integer.
To do this, do I have to use a calculated column and what code would I have to use.
I have tried things such as Date() however it always tells me that I cannot use it in a calculated column.
Thanks
That could be this expression in a query:
YearDiff: [OtherYear]-Year(Date())
I'm trying to make a query using a calculation with Date().
I have a field named [Currentordue] and a field named [duedate]. What I'm trying to accomplish is making a query to limit the results by "if [currentordue] equals "due" or if [duedate] minus today's date is less than 30 days."
I've tried a few different ways but always seem to end with either an error or with no results showing (which would be an error as well since I know there are fields that are due).
Any and all help would be appreciated.
Here is a way to use two different date conditions:
SELECT Table1.Currentordue, Table1.duedate, DateDiff("d",[duedate],Date()) AS Expr1
FROM Table1
WHERE (((DateDiff("d",[duedate],Date()))<30)) OR (((Table1.Currentordue)=[duedate]));
I have a column ProjectYear and a column ProjectNumber; both are numbers. I created a calculated column ([ProjectYear] & "" & [ProjectNumber]) which concatenates the two. For instance, 2015 and 123 gives 2015123.
The issue is that the resulting type of that calculated columns is Short Text, and when I create a query to join to another table which has that column in, but as a numeric type, I get a type mismatch error.
How can I make the calculated column have a numeric type?
I tried CInt([ProjectYear] & "" & [ProjectNumber]), but that it is not allowed.
A calculated field expression can only use a limited set of functions. CInt() is not supported, but Int() is.
I tested this one in Access 2010, with Long Integer for the calculated field's Result Type property, and it does what I think you want ...
Int([ProjectYear] & [ProjectNumber])
Note I believe you are asking about a calculated field in table design, such as this ...
Also note that a calculated field can not be indexed. That has performance implications when you use that field in a join to another table --- although the datatypes can be compatible, it can't take advantage of indexed retrieval.
I have tried to create a calculated field that will show the number of customer transactions processed within 15 minutes.
I have added the expression:
=count(fields!wait.Value<15)
However, when I run the query I'm getting the error message : 'expression used for the calculated field includes an aggregate RowNumber...'
Can you advise please on how to create a calculated field so I can capture the value I want?
I have tried = SUM(IIF(Fields!wait.Value < 15 , 1, 0)) to no avail.
With many thanks.
Calculated fields added to datasets can't have aggregate functions. The calculated field is essentially adding an extra column to your dataset. It sounds like you may want a variable? Used elsewhere in the report, your second expression would work, or the similar
=Count(IIf(Fields!wait.Value<15, 1, Nothing))
would work too.
I have the details of my report being summed up in a summary expression, all works fine. The fields are decimal values of hours worked. Thus, the summary value is also a decimal value. I'd like to access the summary value and convert it to hours / minutes. I've labeled the express as "WorkTimeSum", but can't seem to get a handle to it, however. Fields! obviously won't work since it is a summary expression. I was thinking ReportItems! should work, but to no avail. How can I use this expression field (in a summary row) in an expression in the same summary row?
If I've understood correctly, you're asking how to reference the textbox containing the total work hours value so that you can convert it to hours and minutes using an expression in a different textbox?
You can use either ReportItems! e.g.
=ReportItems!Textbox20.Value)
or ReportItems("") e.g.
=ReportItems("Textbox20").Value
to reference the value of another textbox. Be careful with the names as they are case sensitive.
You can use aggregate functions in any expression. For example, in any header rows you can use the following expression to determine the total hours value:
=Floor(Sum(Fields!hours.Value))
Sum(Fields!hours.Value) is just the total hours in whatever context, e.g. the group total if it's a group header row; you can use this expression as an input in any other expression you require.
It sounds like your issue wasn't the conversion itself, so hopefully this points you in the right direction. If you need further information please specify.