Forms :: Calculate Difference Between Two Query Table Values?
Nov 27, 2014
I am struggling with calculate difference between two query table values, I first created a make a table query(current meter reading) which contains one column called "meter read" , and I created a second make a table query(previous meter reading) which also contains "meter read" column, I linked those two make table queries to calculate the value difference between two date, how can I create a form to calculate diff between any two date?
How do I calculate the values between two columns and populate a third column with those new values? I have an ''Actual Cost'' column and ''Budget Cost'' column and I would like to create a third column ''Margin.''
Is this something that needs to be done with a query or can it be handeled in the design view of a table? I'm starting to learn that Access works nothing like Excel.
Thank you in advance for any help. I scanned some of the threads in this forum, but many were beyond my comprehension. Any walk-through of this procedure would be much appreciated.
I have looked all over for a way to calculate the difference between water meeter readings. My brain may be Friday slow, but all I can find is for calculating differences in dates. My water table has 3 fields: ReadDate, Reading, Calc1
ReadDate is the date the water reading occurred Reading is the meter reading Calc1 is calculated (when I find out how!) by subtracting the current reading from the previous day's reading.
I would like to add the write script in my form so when the readings are entered, the calculation auto populates the field for the user.
I have a subform in which I want to calculate the difference between a start time and finish time, the problem I am having is when the start time is on a different date to the finish time
Start 23:15 on 14th Jan finish 00:015 on 15th Jan, also I want the answer to be the number of minutes. The fields I have are
BatchStartTime Short Time BatchFinishTime Short Time BoilTime ([BatchStartTime] - [BatchFinishTime]) General Number.
There are many batches to enter per job and the MainForm has the StartDate as I didn't want to enter the StartDate for each batch.
ID Up Time Down Time John 18:00 15:00 Kelvin 08:00 08:05 Melisa 23:00 02:00
This is the Table , i need the Query result show IF [Up Time]-[Down Time] is >=3 hrs
Like Below :
ID Up Time Down Time John 18:00 15:00 Melisa 23:00 02:00
IDUp TimeDown TimeJohn18:0015:00Melisa23:0002:00
I tried DateDiff("h",[Up Time],[Down Time]) in Field but POP out with error "Syntax error (comma) in query expression 'Table1.[DateDiff("h",[Up Time],[Down Time])]' " ...
I want to be able to display the result of a difference between Date/Time values in "HH.MM" format (i.e. yes I want the result in decimals and I don't want Access to round up or down just because it feels like doing it!). I have used the following:
Example 1:
Dim ActualManHours as Long ActualManHours = (txtEndTime.Value - txtStartTime.Value) * 86400 txtActualManHours.Value = ActualManHours
Example 2:
Dim ActualManHours as Long ActualManHours = DateDiff("h",txtStartTime.Value, txtEndTime.Value) & "." & Format(DateDiff("n",txtStartTime.value,txtEndTime. value) Mod 60, "00")
Example 3:
Dim StartTime as Double Dim EndTime as Double Dim ActualManHours as Long StartTime = CDbl(txtStartTime.Value) EndTime = CDbl(txtEndTime.Value) ActualManHours = EndTime - StartTime txtActualManHours.Value = ActualManHours
example:new odometer reading - previous odometer reading / filled in qty example: 2000 km - 1000 km / 200 liters = 5 liters /km
Objective: How query will automatically calculate the difference of new odometer reading and last odometer reading for a specific truck number and divide it with filled in qty of fuel?
I,ve made the following date fields in a form: begintime, endtime. I've also made a field Diff that calculates the difference between the two by the code : Diff = Format([begintime] - 1 - ([endtime], "Short Time"). Bij this code you can calculate the difference even over night.
But now I've got to calculate the part of the time someone worked between midnight and 06:00AM if that person indeed worked in those hours.
e.g. someone started at 16:00 end ended at 03:30. The part of time I need = 3:30 e.g. someone started at 01:00 end ended at 11:00. The part of time I need = 5
How can I accomplish this? I hope someone can help me because I'm :confused:
I have to create a query in access that will calculate two Date and time fields [Date & Time Left]/ [Date Returned], need to figure out between the two fields. Trying to identify when the rep returned the call and the number of business hours (6:00am - 4:30pm) it takes to return a message in Ms Access 2010.
Code: SELECT [Message Tracking_tbl].[Date & Time Left], [Message Tracking_tbl].[Date Returned], [Message Tracking_tbl].ID FROM [Message Tracking_tbl];
I'm new to building databases and I wouldn't think that this is difficult but it has stumped me and everyone that I have approached to elegantly perform this calculation.
Essentially I have a table of meters (the best real world example is the watermeter that your community uses to measure how much water you use each month.) Each meter in the table has a "child table" of the date/time that the meter was read and the reading on the meter (stored as a number). I need to calculate the difference between the last two readings in the child table for each meter(essentially how much water each meter has used since the last reading.)
I have been able to sum, average, etc. the meter readings, but I can't seem to find a way to get a difference.
I'm trying to calculate the difference between start and end time, which works fine with:
Total Time: DateDiff("n",[tblTaskTimes]![StartTime],[tblTaskTimes]![EndTime])
However, this is for a database that calculates billable time in 10th of an hour. So, for example, 1 hours would be 1, 30 minutes would be .5, less than 6 minutes would be .1.
The format for this expression is set up to a general number, if that matters.
It's gotta be something in the formula like multiplying this by 24 (for 24 hours) and then dividing by something. Nothing I'm trying is working.
How to implement a functionality into my access database. The related tables required for this functionality can be found as an attachment.
When the information has been entered into the tables by the user, I would like to calculate the difference between the information for each part within the same table. The main columns for which the difference have to be calculated are: [RefObsInfo->RefSources] and [AltObsInfo->StatusAltSource] and [GenObsInfo->GenSources]. The values for these fields are restricted to 3 or 4 different ones. I also would like to show if the GenEstAvailable columns are changed, but that's for later.
In order to calculate this difference a query has to select for each Part the information related to the last date AND a date which has been specified by the user (with the previous date as max). For this the user is asked to give a from date, which she/he can select from a combobox. This combobox has a standard selected value which is the MaxDate-1, i.e. the previous date. The difference should be calculated from the previous date to the last date. I would prefer to give each (predefined) difference a specific action to show the user the difference in a matter of seconds.
Basically, I am trying to calculate a integer number difference from two dates (TAT = Due-Date - Result_Date). The number is calculated and excludes weekends and ideally holidays (for that I have a tblHoliday but not sure how to use it). The function below seems to calculate a number but doesn't exclude weekends.
For example, if Due_Date is 9/26/2014 and Result_Date is 9/30/2014, then TAT is calculated to be 5 (should be 2).Since 9/26/2014 is a Friday only Friday and Monday are used in the calculation.
Code:
Option Compare Database Public Function WorkingDays(StartDate As Date, EndDate As Date) As Long Dim intCount As Long intCount = 0
How can I calculate the difference between two dates but I only want to count the work days? So if was today and I wanted to go until 6/15/2015 the difference would be 5 and not 7 because I do not want to count Saturday or Sunday. Is there a special %datediff function where I would only count work days?
How to set up my tables as I'm just starting off with setting my database up.
I'm doing a simple database to track the purchase orders (PO) I am managing. Each PO has a PO Number and an Original Value. POs may have multiple amendments which would change the PO value. I would however like to keep the history of the PO original value and all different amendments.
So I created two tables:
tblPO: ID PO Number (Number) PO Original Value (Currency) PO Sum of Amendments (???????????) PO Current Value (Calculated = PO Original - PO Sum of Amendments)
tblPOAmendments: ID PO (Lookup from tblPO) PO Amended Value (Currency) Amendment Date (Date/Time) Amendment Desc (Text)
Now the two, million dollar questions are: 1.) Is this the right table structure to use. 2.) How do I go about calculating the Sum of Amendments field?
I have a problem in doing a task with my form. Actually I have a button to add a new record which opens a new form there i enter the values to the record. But when I press the Addnew record button I want to calculate the maximum of the Identity field +1 and open the new form with that new number which i have calculated. How can i do this....
I am trying to calculate the difference in dates between two fields. How do I find the difference in days between field one which contains the date 04/12/2011 and field two which contains the date 04/12/2013? I have tried to use the datediff function, but it keeps telling me it doesn't recognize the field name, even though the spellings correct.
I have to create a query in access that will calculate two Date and time fields [Date & Time Left]/ [Date Returned], need to figure out between the two fields. Trying to identify when the rep returned the call and the number of business hours (6:00am - 4:30pm) it takes to return a message in Ms Access 2010.
The only issue is the calculation has to be done by time and so I have to calculate what time they left the message(so the difference between [Date & Time Left] and [Date Returned) [Date & Time Left] and when the rep returned the message which is suppose to be [Date Returned] but the problem with this field is the data entry is in date format (10/9/2014, 00/00/0000) of Date and not Date and Time like the [Date & Time Left] field, so I don't know what to do now. Not sure what to do now not a database that create or have allot of control over.
Hi everybody. I got a access 2000 query that lists :
1)weekno 2)year 3)project (project number ) 4)QweekylyReportHeader (project description ) 5)customer (customer that requested this project) 6)department (department number and name that implements this project) 7)Projectleader ( project leader name and number that is responsible for this project) 8)Task (Task number that is done for this project ) 9)task description (description of task ) 10)employee ( employee number who is working in this project ) 11)name (Employee name and initial and last that works for this project )
12)hours ( number of hours employee worked in this task ) ==> i want cumulative for this 13)salary (amount of salary given to this employee) ===>i want cumulative for this
I want to create another query that lists :
A)cumulative value of hours worked on particular project task up that point. b)cumulative value for wages given for that project task up that point.
The above query ONLY lists hours worked and wages gives for particular project task only during each week.But i want hours worked and wages give for particle project task up to that point in week. For example a project task might have implemented last week but not this so i want to take that in calculation as well. I be happy if some expert show me how i can calculate the cumulative value for hours worked and wages given for particular project task.
Notes:
- There is a possibility that during a particular week no task been implement for particular project. - One employee can work in more then one project - One employee can have more then one salary (amount) for the same project because he might get raise in salary! - Only tasks carried this week will be printed in the weekly report
http://i5.photobucket.com/albums/y180/method007/constraint.jpg ( pic of database) http://i5.photobucket.com/albums/y180/method007/hourlywagesroportfinal.jpg ( query output population) http://i5.photobucket.com/albums/y180/method007/queryindesign.jpg (query in design view)
query that display hourly wages of certain project during each week
SELECT querythisweek.weekno, querythisweek.Year, querythisweek.Project, QweeklyReportHeader.Customer, QweeklyReportHeader.Department, QweeklyReportHeader.description, QweeklyReportHeader.ProjectLeader, querythisweek.Task, dbo_Task.description, querythisweek.Employee, [lastname] & ' ' & [initials] & ' ' & [insertion] AS Name, querythisweek.hours, querythisweek.Salary FROM dbo_Task INNER JOIN ((QweeklyReportHeader INNER JOIN querythisweek ON QweeklyReportHeader.projectno = querythisweek.Project) INNER JOIN dbo_Employee ON querythisweek.Employee = dbo_Employee.employeeno) ON dbo_Task.taskcode = querythisweek.Task;
code for querythis week( calcualte the salary and hours worked)
SELECT dbo_Hours_worked.Project, dbo_Hours_worked.Year, dbo_Hours_worked.weekno, dbo_Hours_worked.Task, dbo_Hours_worked.Employee, dbo_Hours_worked.hours, (select a.amount * dbo_Hours_worked.hours from dbo_Hourly_wages a where dbo_Hours_worked.Employee = a.Employee and dbo_Hours_worked.Project = a.Project and a.Year * 100 + a.weekno = (select max(b.Year *100 + b.weekno) from dbo_Hourly_wages b where b.Year < dbo_Hours_worked.Year or (b.Year = dbo_Hours_worked.Year and b.weekno <= dbo_Hours_worked.weekno))) AS Salary FROM dbo_Hours_worked;
I have an option group which should display a value from a table if txtWords is null, but the result of a query if txtWords is not null. But though it shows the right results when I load the form, updating txtWords gives me all sorts of errors.
txtWords is in the main form, while the option group optLengthCat is in a subform (but inline).
Form_OnCurrent() event:
Code: 'Enable or disable the option group If Len(Me.txtWords.Value & vbNullString) = 0 Then Me.fsubLengthCat.Form!optLengthCat.Enabled = True Else Me.fsubLengthCat.Form!optLengthCat.Enabled = False
[Code] .....
When I put this into txtWords_AfterUpdate() it starts throwing up errors. Specifically, when I delete a subform record using SQL I get 'record was already deleted by another user'; I think I might have fixed the problem with Me.Requery, but it feels really inefficient.
Should I be using an unbound control? If yes, how do I make an unbound control that can edit or add new records?
