Need An Elegant Way To Calculate Difference Between Numerical Records.
Nov 1, 2007
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.
Thanks in advance,
Corwin
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Jul 25, 2014
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.
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Nov 29, 2004
is there any way I can make a field with a data type that calculates numbers in the field but also allows text to be entered into the field (e.g. N/A or No Score) The non-numerical data certainly wouldn't have to be calculated and could be filtered out when calculating averages and other numerical operations.
Thanks
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Jul 17, 2006
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.
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Aug 3, 2005
Hello,
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:
Thnx Remco
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Oct 25, 2014
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];
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Sep 14, 2014
I have the attached database which calculate the Difference between dates.I have also two problems like i shown in the image
Code:
Option Compare Database
Option Explicit
Sub Recalculate()
Dim rst As DAO.Recordset
Dim dff As Long
[code]...
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Apr 25, 2014
I am trying to Calculate the Date difference between "Material Submit Data" and "Current Date" excluding Weekends.
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Jun 2, 2015
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.
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Sep 20, 2014
Trying to calculate the integer difference between Due_Date and Result_Date excluding weekends and holidays.
I have a table (Holidays) with the dates of the holidays in it. The table looks like:
ID Description Holiday
1 New Years 1/1/2014
2 New Years 1/1/2015
So, if Date_Due: 9/25/2014 and Result_Date: 9/29/2014, then TAT = 2
Since 9/27/2014 and 9/28/2014 are weekends they are excluded from the calculation and only that Thursday and Friday are used in the calculation.
Code:
Private Sub Result_Date_AfterUpdate()
[TAT] = NETWORKDAYS(Due_Date, Result_Date, tblHolidays)
End Sub
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Nov 21, 2013
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.
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Sep 20, 2014
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
[code]...
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Jan 30, 2014
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.
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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?
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Jun 8, 2015
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?
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Jan 22, 2012
DateDiff in a query
I am trying to calculate time difference between two time columns as follows in a query which has a few inner joins
Diff: DateDiff("h",[Table1.TimeStrat],[Table1.TimeStrat])
This gives problem, it is asking [Table1.TimeStrat] to be entered, where is the problem?
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Apr 22, 2013
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.
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Oct 26, 2014
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.
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Jul 9, 2013
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])]' " ...
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Jan 27, 2015
I am designing mileage database in access 2010.
table:
1- maintbl (date, truckNo fillinQty,rate,cost, odometer, mileage)
Query:
1- mainquery (based on maintbl)
Form:
1- mainfrm (Based on mainquery)
i want to calculate mileage :
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?
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Jun 18, 2007
Hi there
I am trying to get a very simple thing done in Access and I must have spent almost over 2 days of Internet time to do so. My problem is that I need to get the difference in 2 records to show in a query.
e.g. MyTable has 2 fields: 1. MyDate 2. MtrReading
Everyday I enter date in MyDate and a number in MtrReading. And I need to find out the difference between today's MtrReading and Yesterday's Mtr Reading.
Any help is greatly appreciated!
Thanks
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Sep 8, 2005
I currently have a table with the following fields:
dtmDateintPressintCycleintProgramintLotysnAxialdtmFStartdtmFFinishdtmPStartdtmPFinishdtmDStartdtmDFinish
How might I go about querying the difference between dtmDFinish and dtmFStart for multiple records?
EX:
09/07/05-1-1-1-5681-NO-12:30-1:00-1:30-2:00-2:30-3:00
09/07/05-1-1-1-5681-NO-3:30-4:00-4:30-5:00-5:30-6:00
09/07/05-1-1-1-5681-NO-6:15-6:45-7:30-8:00-10:30-11:00
Would return two results: difference for 3:30-3:00 = 30 minutes and difference for 6:15-6:00 = 15 minutes
Thanks for your help!
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Aug 12, 2015
I have a query that must calculate the different between values in two different records, based on the date.
The underlying ORIGVALUES table contains:
Date; Value; Diff
1/10/15; 100; (this is what I am trying to calc)
1/11/15; 101; (this is what I am trying to calc)
1/14/15; 102; (this is what I am trying to calc)
What is the best way to have each record calculate the selected date value divided by the prior date value)? E.g.
For 1/11 the math is 101 / 100 (so the 1/11/15 record would show the result of 1.01)
For 1/14 the math is 102 / 101 (1/11 to 1/14 represents a weekend)
I could copy the prior day values to the current day records and do that math easily but that is very redundant.
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May 1, 2006
I am trying to write an expression that calculates a new field in a query. The new field is simply recoding values from another field (survey question responses) using IIf statements. This new field, let's call it RecodedResponse, will eventually be summed in a totals query to get the total score on that survey for each participant. Each record is a question response and there are multiple records for each participant (16 items on this particular survey). The problem is that for 2 of the questions on this 16 item survey, the responses are supposed to be eventually combined and recoded based on each other. So, my question is:
Is there a way to do a conditional expression where the result from the previous record is used? Or do I need to first do a crosstab query so that all the responses for one participant are on one line?
I am pretty sure I can do a workaround to make it work, probably doing a crosstab, then recoding in another query based on the crosstab, but it would be cleaner (I think) to do this some other way. Any ideas? Or is this too vague?
Thanks,
Liz
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Jan 4, 2014
How to extract or calculate the number of records in a sequence - e.g. in a table/query ordered by ID and date, the number of consecutive records by date for a given ID that have a value >= 50 in a given field. Is there a way of doing this purely within a query, or would I have to resort to a VBA loop through a recordset and keep a count of the consecutive records that match that criteria?
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Dec 8, 2004
On a bank draft I need the dollar amount spelled out in a text format. Will Access do that? If so, how?
Jeff
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