Identifying overlapping time slots (clashes) in a oracle timetabling system

Good Morning
I have a timetableing table that has 3 fields, student number(number), start time(date), end time(date) where each row which represents an exam event for a student.
I need to write a query that identifies records for students where there is a clash
ie) two or more event are scheduled for an individual student where the subsequent events starts while the previous events are still occurring.
Put another way I need to flag rows for individual students that have time slots that overlap.
Is a neat way of doing this?
Any idears
Thanks
David Hills

I've added a unique identifier and a few more records
also changed the end time of some of the records so
they end in the middle of another records slot.
create table timetableing
as
select 1 id,12333 student_number, to_date('01012007 120000','ddmmyyyy hh24miss') start_time, to_date('01012007 140000','ddmmyyyy hh24miss') end_time from dual union all
select 2 id,12333, to_date('01012007 130000','ddmmyyyy hh24miss'), to_date('01012007 150000','ddmmyyyy hh24miss') from dual union all
select 3 id,12333, to_date('01012007 160000','ddmmyyyy hh24miss'), to_date('01012007 170000','ddmmyyyy hh24miss') from dual union all
select 4 id,12333, to_date('01012007 120000','ddmmyyyy hh24miss'), to_date('01012007 133000','ddmmyyyy hh24miss') from dual union all
select 5 id,12345, to_date('01012007 140000','ddmmyyyy hh24miss'), to_date('01012007 150000','ddmmyyyy hh24miss') from dual union all
select 6 id,12345, to_date('01012007 160000','ddmmyyyy hh24miss'), to_date('01012007 170000','ddmmyyyy hh24miss') from dual union all
select 7 id,12345, to_date('01012007 130000','ddmmyyyy hh24miss'), to_date('01012007 142000','ddmmyyyy hh24miss') from dual union all
select 8 id,12345, to_date('01012007 120000','ddmmyyyy hh24miss'), to_date('01012007 150000','ddmmyyyy hh24miss') from dual union all
select 12 id,12333, to_date('01012007 130000','ddmmyyyy hh24miss'), to_date('01012007 150000','ddmmyyyy hh24miss') from dual union all
select 13 id,12333, to_date('01012007 160000','ddmmyyyy hh24miss'), to_date('01012007 170000','ddmmyyyy hh24miss') from dual union all
select 14 id,12333, to_date('01012007 120000','ddmmyyyy hh24miss'), to_date('01012007 133000','ddmmyyyy hh24miss') from dual union all
select 15 id,12345, to_date('01012007 140000','ddmmyyyy hh24miss'), to_date('01012007 150000','ddmmyyyy hh24miss') from dual union all
select 16 id,12345, to_date('01012007 160000','ddmmyyyy hh24miss'), to_date('01012007 170000','ddmmyyyy hh24miss') from dual union all
select 17 id,12345, to_date('01012007 130000','ddmmyyyy hh24miss'), to_date('01012007 142000','ddmmyyyy hh24miss') from dual union all
select 18 id,12345, to_date('01012007 120000','ddmmyyyy hh24miss'), to_date('01012007 150000','ddmmyyyy hh24miss') from dual
The required output from the view would be some thing like
student number _______________clashing records
12333 ________________________2,4,12
12333 ________________________3,13
12333 _______________________4,14
12345________________________5,7,17
12345 ________________________8,18
etc
Thanks
David

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infile 'C:\external\my_data.txt'
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Guys,
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1001 12/31/9999 04/01/2010 2010.1.1
1001 01/31/2010 03/01/2010 2010.1.2
1001 12/31/9999 02/01/2010 2010.1.3
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Hello:
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Thans for pointing out the error in my post. It seems, being rather busy in this period, I'm starting to wear out as I missed the fact the overlaps would be returned twice. :(
I had in mind a more general case where as single row overlaps with more than one other row.
The OP's data contained one to one overlaps only and it seems no generalized approach was needed.
with
the_data as
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order by name
with
the_data as
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select 'B' name,to_date('26/03/2011 10:59:58','dd/mm/yyyy hh24:mi:ss') start_time,to_date('26/03/2011 11:10:50','dd/mm/yyyy hh24:mi:ss') end_time from dual union all
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t as
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from the_data
select name,
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from t
where start_of_group = 0
group by name
order by nameRegards
Etbin

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Hi Experts,
I am having a small problem. Time slot divisions.
In my selection screen I have taken Date and time fields. If I entered one date (suppose 03/01/2006) and time slot as (12:04:56 to 05:08:34).
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12:00:00-12:59:59
01:00:00-01:59:59
02:00:00-02:59:59
03:00:00-03:59:59
04:00:00-04:59:59
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Hi prabhakar,
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07.02.2006 09:00:00
07.02.2006 10:00:00
07.02.2006 11:00:00
07.02.2006 12:00:00
07.02.2006 13:00:00
08.02.2006 09:00:00
08.02.2006 10:00:00
08.02.2006 11:00:00
08.02.2006 12:00:00
08.02.2006 13:00:00
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REPORT abc.
DATA : mydt TYPE sy-datum,
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Screen
SELECT-OPTIONS : dt FOR sy-datum,
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tm-high = '130000'.
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regards,
amit m.

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Hi,
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Immediate reply is realy appreciated.

Hi Shaik,
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rac1 Observer
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NTP Configuration file check started...
The NTP configuration file "/etc/ntp.conf" is available on all nodes
NTP Configuration file check passed
Checking daemon liveness...
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Starting Clock synchronization checks using Network Time Protocol(NTP)...
NTP Configuration file check started...
The NTP configuration file "/etc/ntp.conf" is available on all nodes
NTP Configuration file check passed
Checking daemon liveness...
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rac1 yes
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PRVF-5415 : Check to see if NTP daemon is running failed
Result: Clock synchronization check using Network Time Protocol(NTP) failed
PRVF-9652 : Cluster Time Synchronization Services check failed
Post-check for cluster services setup was unsuccessful on all the nodes.
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Check CTSS state started...
Check: CTSS state
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rac2 Observer
CTSS is in Observer state. Switching over to clock synchronization checks using NTP
Starting Clock synchronization checks using Network Time Protocol(NTP)...
NTP Configuration file check started...
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PRVF-5405 : The NTP configuration file "/etc/ntp.conf" does not exist on all nodes
rac2
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PRVF-9652 : Cluster Time Synchronization Services check failed
=============================================================
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Hi,
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rac1 passed
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Querying CTSS for time offset on all nodes...
Result: Query of CTSS for time offset passed
Check CTSS state started...
Check: CTSS state
Node Name State
rac2 Observer
rac1 Observer
CTSS is in Observer state. Switching over to clock synchronization checks using NTP
Starting Clock synchronization checks using Network Time Protocol(NTP)...
NTP Configuration file check started...
The NTP configuration file "/etc/ntp.conf" is available on all nodes
NTP Configuration file check passed
Checking daemon liveness...
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rac1 yes
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rac1 yes
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rac1 yes
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NTP Configuration file check started...
NTP Configuration file check passed
Checking daemon liveness...
Liveness check passed for "ntpd"
NTP daemon slewing option check passed
NTP daemon's boot time configuration check for slewing option passed
NTP common Time Server Check started...
PRVF-5410 : Check of common NTP Time Server failed
PRVF-5416 : Query of NTP daemon failed on all nodes
Clock synchronization check using Network Time Protocol(NTP) passed
Oracle Cluster Time Synchronization Services check passed
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[oracle@rac1 ~]$
================================================================================
I hope the problem solved. Am i correct??

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First 3 .as are the component
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x=(2500*2(distance))/(2*10(8))
it get 25micsecond

yeah that's the minimum frame, but why .
i made some research on that
here's the results.
we need to discovre the total path delay.
25us for 2500 cable
4 repeaters class I add 0.7us for each repeater
DTE delay
and safety margin
so
total delay=link delay+repater delay+DTE delay+saftey margin
that should come out 51.2us :))
still need to get the numbers thu

While doing puchout user is getting Overlapping time message in OTL Time entry responsibility

while doing puchout user is getting Overlapping time message in OTL Time entry responsibility

XmlBeans, at least the version I'm working with now, doesn't support version 3 of the Document Object Model (DOM). I don't know what operations were introduced in DOM 3, but I guess you're trying to use one of them. What worked for me is to copy the Document into a DocumentBuilder that does support DOM 3, such as the JDK's own builder, and work with the copy. This should be all right if the document is not too large. The following URL has the details:
http://issues.apache.org/jira/browse/XMLBEANS-100
(Look for the post dated 22/Aug/08, which as I write this is the very last post.)

About changes in existing Times slots.

I see that the standard behavior in ISH is to allow changes in time slots despite having existing appointments for care units. Is there a customizing point I am missing? Thanks.
Daniel;

Sorry Alberto. This is not helping. Again my problem is for exisinting planings that already have appointments. If some one access NR25 without checking the NR16 that person can modify the planing with no warning that open appointments are pending. Thank Regards Daniel.

Java servlet to check availability of time slots for booking meeting

I am keeping two time stamps into a table ie start time and end date.Start date and end date should be greater than present system date.In a java servlet i am linking and comparing the time stamps that entered through availability checking form.Availability check form , a jsp ,will take the start time and end time .After pressing the search button it will yield the available slots for choosing to book.Can you please suggest me how can i implement the logic.I have tried to use vector to store the slot info but resulted in error .

Well, at the minimum you will need a Booking object. It will at a minimum have start and end as Date variables. You probably will also want another Date called bookedOn (or something similar) or use a boolean to indicate that the slot is no longer available.
You will have to write a SQL query that will use the start and end dates the form supplies for time slots that match these criteria (and likely bookedOn values not equal to null). Your DAO will populate a series of Booking objects based on the query results.
When the user selects a given slot, populate the bookedOn date or the boolean flag indicating the time slot is now taken.
Without more requirements or where you are stuck, it's hard to help beyond that.
- Saish
PS: Unless you need synchronization, use List/ArrayList rather than Vector

Identifying overlapping time slots (clashes) in a oracle timetabling system

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