| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
 |
 | |||
| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
|
| |||
Home -> Community -> Mailing Lists -> Oracle-L -> Re: Finding overlapping time periods - suggestions please
Mladen,
The information might be excellent for the "lecture on the Space and
Time Continuum" but a "black hole" will destroy all theories of anything
overlapping when they are on the same plain. Of course there has to be
an "guess work theory" about where the stuff the black hole consumes
ends up, and does it have the ability the grow at a rate proportional
the the volume it consumes?
Ron mª¿ªm
>>> mladen_at_wangtrading.com 10/31/03 02:54PM >>>
I have once been asked to suggest the solution for the same problem,
and I have
suggested a solution which was out of this world, but completely in
line with
my education of a mathematician. The project was scrapped and I didn't
have an
opportunity to apply the solution.
To start describing the solution, let me remind you that overlapping
areas of space
would be discovered by using spatial option. To apply the spatial
option, you
need to define distance function. Temporal difference does satisfy the
necessary
conditions for a distance function, as far as mathematics is
concerned.
In mathematics, there is a structure called "metric space", which is,
basically,
a set with a distance function. Distance function d ("metric") on set
S is a function
d:S x S->R which satisfies the following two conditions:
Points in time, with the difference in seconds do satisfy the above
conditions, which means that you
can define geometry and use spatial option.
Next lesson will be about Cauchy sequences, complete metric spaces,
continuous functions, contractions
and Banach theorem. If Cary got away with queuing theory, why wouldn't
I get away with some abstract
calculus and general topology?
As I've said earlier, I've never actually had an opportunity to
actually apply this solution, but it
still looks quite elegant to me, despite it's apparent oddity.
On 10/31/2003 01:24:37 PM, babette.turnerunderwood_at_hrdc-drhc.gc.ca
wrote:
> I was wondering if anyone had the need to find overlapping time
periods and how to identify them efficiently.
>
> Here is the scenario:
>
> Elapsed minutes refer to the actual "clock" time either
spent on a given task. Thus an activity that started at 9:00 am and
finished at 11:00 am on the same day is said to have 120 elapsed
minutes.
> If one task overlaps another (either completely or
partially with another task), then the tasks are said to be
"multitasked". In that case the system will store the portion of the
elapsed time that was multitasked as "elapsed multitask minutes" and the
portion of the time that was not overlapped as "elapsed single minutes".
In addition, for the portion of time that two or more activities were
simultaneously taking place; their time will be divided by the number of
simultaneous activities and stored as "prorated multi minutes". The sum
of Elapsed Single Minutes and Prorated Minutes will equal the actual
clock time that a vehicle was active.
> The following example should help to illustrate these
concepts. In the table below a list of fictitious activities for a
vehicle are shown in addition to how the time is allocated to the
various measures:
> Activity Start Time End Time Elapsed Minutes Elapsed
Multitask Minutes Elapsed Single Minutes Prorated Multi Minutes Prorated Minutes
> 1 10:00 12:00 120 60 60 25 85
> 3 11:00 13:00 120 120 0 55 55
> 4 11:30 13:30 120 90 30 40 70
> 7 13:30 16:00 150 0 150 0 150
>
Totals 510 270 240 120 360
Mladen Gogala
Oracle DBA
Note:
This message is for the named person's use only. It may contain
confidential, proprietary or legally privileged information. No
confidentiality or privilege is waived or lost by any mistransmission.
If you receive this message in error, please immediately delete it and
all copies of it from your system, destroy any hard copies of it and
notify the sender. You must not, directly or indirectly, use, disclose,
distribute, print, or copy any part of this message if you are not the
intended recipient. Wang Trading LLC and any of its subsidiaries each
reserve the right to monitor all e-mail communications through its
networks.
Any views expressed in this message are those of the individual sender,
except where the message states otherwise and the sender is authorized
to state them to be the views of any such entity.
-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Mladen Gogala INET: mladen_at_wangtrading.com Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Ron Rogers INET: RROGERS_at_galottery.org Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Fri Oct 31 2003 - 14:34:25 CST
 |
 |