Subtracting Dates From Adjacent Dates In Same Column
Sep 7, 2006
Hiya-
I have a database with 5000 entries, corresponding to about 10 entries for about 500 people. Each of the entries is dated, and I need to calculate the time intervals between each person's sequential entries in the table.
One way of doing this is to create another column that contains the date of the previous entry. I can then use DateDiff to subtract one date from the other and give me the difference in days.
This approach falls down if I then work with only a subset of the entries - I would have to re-enter the previous entry dates as the time intervals would have changed.
What I really need is a way of subtracting the date from the date in the cell directly above it. Will Access let me do this, or is there a better way?
I found the following code on this site in a search for a method to subtract two dates ie [Startdate] and [EndDate] and display the result as a whole number. ie 2, 6 etc. This code finds the difference but displays the results as 1 year 5 months 2 days, where I need the equivalent as 17. Can this code be modified to produce the desired result and if so how would I go about it. Thanks for the help.
Option Compare Database Option Explicit
Public Function getTimeElapsed(StartDate, Optional EndDate As Date) As String On Error GoTo Err_Handler
If IsNull(StartDate) Then getTimeElapsed = "No startdate" Exit Function End If
Dim YY As Integer Dim MM As Integer Dim DD As Long
' use current day if EndDate is not supplied, ' + 1 makes both days inclusive. EndDate = IIf(EndDate = 0, Date, EndDate) + 1
MM = DateDiff("m", StartDate, EndDate) DD = DateDiff("d", DateAdd("m", MM, StartDate), EndDate)
' recalculate if DD is negative. If DD < 0 Then MM = MM - 1 DD = DateDiff("d", DateAdd("m", MM, StartDate), EndDate) End If
YY = MM 12 ' integer division. MM = MM Mod 12 ' remainder.
getTimeElapsed = YY & IIf(YY < 2, " year ", " years ") & _ MM & IIf(MM < 2, " month ", " months ") & _ DD & IIf(DD < 2, " day", " days") Exit Function
My form consists of a textbox with a selected date. I have a combo box with integers 1-15. I have a table with 15 people and their birthdays.
I am trying to find the birthdays after a selected date by the integer selected in the combo box. For example, if I select 2/1/2013, and pick 7 in the combo box, the subform should show me people with birthdays 2/1 through 2/8.
I have a query with a datediff function. This is my query expression Expr1: DateDiff("d",[DateofBirth],[Forms]![Calendar]![Text1]) The criteria is <=[Forms]![Calendar]![Combo3].
It displays some data, but it's not consistent at all. I'm hoping to fix this without any SQL changes or form code. But if that's what I need, I'll do it.
Is it possible to perform calculations across 2 adjacent rows in SQL?
At the moment, I have a running count that tracks the number of updates that go into our database against a specific JobID.
Is it possible to subtract the running count for a previous update from the current update.
For example, I would like my resulting table to end up looking like this
JobID Time Updates Since Last Update 1 10:10:00 1 1 1 10:30:45 3 2 1 11:15:10 9 6
In this example, the Since Last Updates should be found by subtracting the Updates at 10:10:00 from the Updates at 10:30:45 giving 2 and the Updates at 10:30:45 from 11:15:10 giving 6. It would continue like this for as many rows of data have the same JobID (which could be several hundred!)
What I would then like to do is use the 'Since Last Update' number to display only those updates that are applicable to a certain Time, perhaps using Select Top in SQL.
Am I approaching this from the right direction, or would it perhaps be better to try to do this using Time, as this will always be unique?
Jus thought I'd offer this code to the forum as spent a long time finding a suitable solution..
SELECT DischargeTime.ID, [Arrival Times].ID, [Arrival Times].[A&EArrivalDate], [Arrival Times].[A&EArrivalTime], DischargeTime.[Date of outcome], DischargeTime.[Time of outcome], DateDiff("d",[A&EArrivalDate],[Date of outcome]) AS DateDifference, [Time of outcome]-[A&EArrivalTime] AS TimeDifference, IIf([DateDifference]>=1,([DateDifference]*(1/24)*576)+[TimeDifference]*(1/24)*576,([DateDifference]*(1/24)*576)+[TimeDifference]*24) AS hours3 FROM DischargeTime INNER JOIN [Arrival Times] ON DischargeTime.ID = [Arrival Times].ID;
Basically I had an admission date and in a seperate box an admission time and then I had a discharge date and discharge time again in seperate boxes. The information was spread over two tables hence the join. How I solved the problem was by gaining both the days difference between and then the difference in hours and then I created an iff function and played around with it till it worked. Dont really know how i got it working in the end but it does so hopefully this code will save some1 alot of time!
(I know that if id shown my dates as date/time in 1 box the problem would have been much easier solved, however I dont personally like displaying dates and times that way especially when you have inexperienced people entering data)
Find below a result from the query
DischargeTime.IDArrival Times.IDA&EArrivalDateA&EArrivalTimeDate of outcomeTime of outcomeDateDifferenceTimeDifferencehours3 1119/06/200715:0420/06/200712:00103:0420.93
Here's a sample of the query code for survey I made, for example Question 1 will be 1) Male or Female? (radio button answer_id 111) Male (radio button answer_id 112) Female
etc etc...
My question is how do I set my query to show a graph / percentage value of total unique answer_id's in relation to the question_id.
e.g. Question 1: 66.67% chose 111, 33.3% chose 112
I hope I was clear enough am quite new to Access and I really thought I could do this with pressing a few filter/sort buttons but alas I haven't found a way yet.
Question... i Wanted to create a Graph that has a bar for each category or column that has dates.. i want it to filter to show only the dates greater than 12-31-2011 so basically all dates in 2012.. i figured out how to do a query but i was only able to do a query for ONE column at a time so i'll have like 30 querys...is there a way to do this with one query and have each bar on the graph be for each column and have the graph showing how many people have completed these after 12-31-2011. URL...
I have built a query to calculate the expiry dates of training courses but I am trying to input a criteria so that only dates within 90 days of todays date show. I am using Date()<90 but it doesn't return the correct information. What the criteria should be for this?
I have a table of records, which has within it two date fields (effectively, a 'start' and 'end' date for that particular record)
I now need to create a query to perform a calculation for each date between the 'start' date and the 'end' date
So the first step (as I see it anyway) is to try to create a query which will give me each date between the two reference dates, in the hope that I can then JOIN that onto another query to perform the necessary calculation for each of the returned dates.
Is there a way to do this?
So basically, if for a particular record, the 'start' date is 01-Apr-2015 and the 'end' date is 09-Apr-2015, can I produce a dataset of 9 records as follows :01-Apr-2015
(The *obvious* solution would be to create a separate table of dates, from which I could just SELECT DISTINCT <Date> Between #04/01/2015# And #04/09/2015# - but that seems like a dreadful waste of space, if that table is only required to generate the above? And it would have to cover all possible options; so it would either have to be massive, and contain every possible date - ever! - or maintained, adding new dates as necessary when they are required. Seems horribly inefficient!)
Is it possible to just select each date between the two reference dates? Or can you only query something which exists somewhere in a table?
So I have a report generated, listing all my companies personnel in one column and the next column has the expiration dates of a certian training certificate. My question i would like to add some statistics to the bottom of the report, mainly how many certificates are expired, which is the ones over a year.
I have attempted to use:
=Sum(IIf([AT_LEVEL 1]<"Now()-365",1,0))
previously in excel my spreadsheet counted it like this:
How to create a table in MS Office. Current table has name in first column and start & finish dates in other two columns. It is necessary to create a table in MS Access which has name in the first column and validation dates in the second column. For Example:
currently
1. White 16 xxxx19 2. Black 1 xxxx 5
required
1. White 17 1. White 18 2. Black 2 2. Black 3 2. Black 4
I have two tables with dates. Between (!) every two following dates in table1, I want to know the number of dates in table2. How do I write an SQL query for this? The tables I have are up to a few hundred records in table 1 and a few thousand records in table2. So to prevent that this takes hours I need a fast query.
To explain the query I need, for example: table1 01/01/2014 15/01/2014 17/01/2014 30/01/2014
Explanation: Between 01/01/2014 and 15/01/2014 in table 1 there are 2 dates in table2 (01/01/2014 is not included between the dates) Between 15/01/2014 and 17/01/2014 in table 1 there are 0 dates in table 2 Between 17/01/2014 and 30/01/2014 in table 1 there are 4 dates in table 2
I have a master table which shows all transactions per record (person) over a financial year.
Each record person has a seperate package period over which their spend needs to be measured. Therefore although I have all their transactions for the year, I only want to sum their transactions between their given [start date] and [end date] which are in columns.
I need to be able to create a field which sums all expenditure per record between the start and end dates
Name Start Date End Date Invoice Date Amount
Matt 15/5/11 15/9/11 1/11/11 £100 Matt 15/5/11 15/9/11 7/7/11 £200 Matt 15/5/11 15/9/11 12/12/11 £200
In this case I would only want to sum 7/7/11 as this is between the start and end dates
I want to write something like sumif([Invoice Date] is between [start date] and [end date] - not sure where or how exactly
(The start date and end date will always be the same per person)
I am trying to format an excel spreadsheet through access, specifically trying to convert a column from text to dates (I receive the data in text format and need to translate it to dates).
Code: Dim excelApp As Object Set excelApp = CreateObject("Excel.Application") excelApp.screenupdating = False excelApp.Visible = False Set excelWB = excelApp.workbooks.Open("Z:DataBasicSMData.xlsx")
[Code] ....
I'm no longer getting an error, but it isn't actually modifying the spreadsheet...
Please bear with me here as it's a little involved.
I'm doing a staff profile website which includes a section where they can enter their annual/other leave details.
I decided to store their leave in two fields Start_Date | End_Date rather than each individual date that they took - the short and wide approach vs long and narrow.
This has left me needing to do a query that would return all the dates between the start and end dates inclusive.
I appreciate i could do this using some script to loop through a recordset and build an array of dates but i wondered/hoped that it could be done using SQL.
As it is an asp page i can't use user defined functions in a VBA module in Access so the solution would need to be pure SQL.
I have a scenario where the first three rows of date which have dates of 4/1, 4/4/ 4/6 with ndc 5513026701; next six rows that have dates from 4/8 to 4/20 with ndc 5513014801; next three rows that have dates from 4/25, 4/27, 4/29 with ndc 5513026701.
The issue I am having is I do not know how to have separate min/max dates for ndc 5513026701 since when I group by ndc 5513026701 min = 4/1 ; max = 4/29. I need to have min = 4/1 and max = 4/6 for one row and another row of min = 4/25 and max = 4/29.
Any easy way to sequentially create min/max for each ndc 5513026701? I wasn't sure how to verbalize this so I have attached a sample worksheet.....
I'm not sure if I am biting off more than I can chew. I have a text field in each record in my database (Inherited) The db has nearly 5,000 records. I would like to split the field into records in a seperate table. An Example of the table as is now;
Is this possible in one hit or do I need to process the records without dates first and then run another process to split those with Dates? I say dates but the field is a text field. About 15-20% of the records contain dates which are always enclosed in parenthesis.
I have two columns, one is number needed and the other is number stocked. How can I get the number stocked column to subrtract from the number needed column. I need to have it done in query. Those are also the title of the columns. Thanks.
I have a client that wants to enter a range of dates in a query of when they will call that person back. Then they want to be able to type in a range of dates and have a make table query show them all the people that fall in between these two dates....is this even possible??? Ex. Joe March 3 to March 8 Mary March 4 to March 9 John March 5 to March 10
So if they type into the query March 3 to March 6 all three people should show up because one of the dates specified lies within the parameters they are asking for.....man I am out of ideas
I want to add Hours to a date value. For example the date value=05/04/2005 18:12:35 I want to add three hours to that date value so the new date value will be 05/04/2005 21:12:35. Is there operatior to add dates.
Set db = CurrentDb() str = "SELECT ID, Date, Item, QtyRec, QtyIssue FROM DailyIssue Where Date >= '" & SDate & "' AND DATE <='" & Edate &"'" Set rs = db.OpenRecordset(str, dbOpenSnapshot)
But it is not working at all. Error message is Data Type Mismatch.
i've been reading about the us/uk date problem and found some helpful threads such as http://www.access-programmers.co.uk/forums/showthread.php?t=39675 but would like to ask (cause i'm still a bit confused):
if someone enters all of the dates into an .mdb the same way, either day-month-year or month-day-year, will the dates somehow be stored correctly regardless of the system's setting? (in this case, entered day-month-year into u.s. system-settings).
i have seen how access flips "wrong" dates. if i understand correctly, the dates are then actually stored "flipped", or wrongly.
is there some way of making the wrong dates (the ones that have been flipped) right again?
also, how does one view the dbl-precision number that is stored?
I capture last change date on a form using now(). When I export the file my vendor wants the date to be a text field and 8 bytes in length. It has to fill 8 bytes like this - YYYYMMDD
Example in my form - 3/1/2007 8:11:55 AM
I need to convert this to text - 20070301 when I export my file.
