quantifying overlapping time spans
Hi all,
I am trying to write a query to calculate the amount of time that any two
individuals overlap in their use of a location. My table currently looks like
this:
Date Time IndividualID ArrivalTime DepartureTime
Individuals can arrive and depart at different times, and stay for different
amounts of time. Individuals remain at the location for as little as a few
seconds or up to 20 minutes. I am trying to determine the following:
1) for each pair of individuals, how much time were they both at the location?
(shared presence)
I need the results to appear something like this:
Individual1 Individual2 SharedPresence (in minutes)
A B 0.2
A C 1.4
A D 10.0
B C 4.2
B D 0.9
....etc.
2) at any one time point, I need to be able to determine all of the
individuals present
Any ideas? I have some experience with Access and writing queries, but
haven't gotten into writing macros or anything like that. Any comments or
suggestions would be very appreciated.
Thanks for your time,
Liz
--
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EHobs
6/4/2010 11:46:56 PM
access.modulesdaovba
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EHobs via AccessMonster.com wrote:
>I am trying to write a query to calculate the amount of time that any two
>individuals overlap in their use of a location. My table currently looks like
>this:
>
>Date Time IndividualID ArrivalTime DepartureTime
>
>Individuals can arrive and depart at different times, and stay for different
>amounts of time. Individuals remain at the location for as little as a few
>seconds or up to 20 minutes. I am trying to determine the following:
>
>1) for each pair of individuals, how much time were they both at the location?
>(shared presence)
>
>I need the results to appear something like this:
>
>Individual1 Individual2 SharedPresence (in minutes)
>A B 0.2
>A C 1.4
>A D 10.0
>B C 4.2
>B D 0.9
>...etc.
>
>
>2) at any one time point, I need to be able to determine all of the
>individuals present
To find all overlaps you can use comparisons like:
start1 < end2 And start2 < end1
and the duration of the overlap can be calculated with an
expression like:
((end1 - start1) + (end2 - start2) - Abs(start1 - start2)
- Abs(end1 - end2)) / 2
This can all be done with a query:
SELECT table.IndividualID As Individual1,
X.IndividualID As Individual2,
(DateDiff("n", table.ArrivalTime, table.DepartureTime)
+ DateDiff("n", X.ArrivalTime, X.DepartureTime)
- Abs(DateDiff("n", table.ArrivalTime, X.ArrivalTime)
- AbsDateDiff("n", table.DepartureTime,
X.DepartureTime)
) / 2 As SharedPresence
FROM table, table As X
WHERE table.IndividualID <> X.IndividualID
And table.ArrivalTime < X.DepartureTime
And X.ArrivalTime < table.DepartureTime
To find all the individuals at any point in time, the query
is simpler:
SELECT table.IndividualID
FROM table
WHERE [Enter Time] Between table.ArrivalTime
And table.DepartureTime
--
Marsh
MVP [MS Access]
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0 |
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Marshall
6/5/2010 1:02:22 PM
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I am trying to figure time worked on a daily basis. I have done thi formula before, but have forgotten how to complete it. My times look like (2nd shift hours) 3:30 PM 12:30 AM The formula needs to calculate hours worked greater than 5.5 to tak out 1/2 hour lunch, and hours worked less than 5.5 to calculate tota hours with no lunch. We do not clock in and out for lunch breaks, i is an automatic deduction, but somebody has earased my formula. Please help! -- LGrob ----------------------------------------------------------------------- LGrobe's Profile: http://www.excelforum.com/memb...
overlapping elements in tabs
hello, how can i manage to avoid overlapping elements in tabs. for example: if i have a group box and want to use a check box in the group box header sometimes it works, but most of the times the check box is hidden under the group box. is there an option to 'order' the elements like we know it from powerpoint? thanks for the help - happy easter manuel "baeman" <baeman@gmx.net> wrote in message news:1635d65f-03ec-480a-a8db-ff3d12543281@s37g2000prg.googlegroups.com... > hello, > > how can i manage to avoid overlapping elements in tabs. > > for examp...
Access 2007 Run-time Error 2467 when accessing a listbox value on a sub form
I have a database that has been in production on Access 2003 for quite some time and has run without errors. A user's machine was recently upgraded to Access 2007 and now the database throughs a Run-time Error 2467 "The Expression you entered referes to an object that is closed or does not exist" on the following line that references a listbox value on a sub form. If Nz(Me.sfrm_Consultant_Contract_Request.Form.Cmb_Consultant.Value) = "" Then .. .. .. I changed the code to If Nz(Forms! frm_Main.sfrm_Consultant_Contract_Request.Form.Cmb_Consultant.Value) = ""...
How can I Sum time duration?
I have a spreadsheet that is output from an in house system. One of the columns is "Duration", and is of the form "+0 hh:mm:ss.xxx", e.g. "+0 00:09:11.983" where I'm guessing +0 is the number of days and is always 0 in my examples, and hh:mm:ss is hours:minutes:seconds and xxx is milliseconds. I want to be able to add all of the Durations to arrive at total time, preferably as a largish number of minutes, typical totals being up to millions of minutes. I've tried using Sum, but this returns 00:00:00 I'm sure there must be an easy way to do thi...
Opening a word file opens "New" every time
Every time I open a file from a folder by double-clicking it opens as "New" and I'm unable to save it over the same file. In order to open it I have to right-click and click "open". The "New" opention from the drop down menu is also bolded. How do I change the default to "open" not "open new" ? -- Danish.inc First try the simple fix: Click the Windows Start menu and choose Run, type in winword /r (note the space before the slash), and click OK. That will rewrite Word's registry entries and may fix the pr...