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Comparing date times start time and end time using between

Posted on 2010-09-09
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Last Modified: 2012-05-10
I cant seem to get the right combination to generate the proper results.  I need to compare the start date and end date to determine if rows are overlaping.  Example

RowID        StartTime                           EndTime
1                9/11/2010  08:00:00         9/11/2010  09:00:00
2                9/11/2010  07:30:00         9/11/2010  08:30:00
3                9/11/2010  08:30:00         9/11/2010  09:30:00
4                9/11/2010  09:30:00         9/11/2010  10:30:00

I need to return row 1,2 and 3 but not row 4 since the start time is the same as the end time of the previous appointment. Any help is greatly appreciated.
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Question by:clintnash
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6 Comments
 
LVL 20

Expert Comment

by:dsacker
ID: 33638162
Try this:
select RowID,
       StartTime,
       EndTime
from   MyTable
where  StartTime NOT IN (select EndTime from MyTable)

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0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 33638280
what about this:
select t.*
 from yourtable t
 where exists( select null from yourtable o where o.starttime < t.endtime and o.endtime > t.starttime )

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0
 
LVL 3

Accepted Solution

by:
mehdi_javan earned 500 total points
ID: 33638466
I think you need this:

Select t1.* 
from YourTable t1
where exists (select null from YourTable t2
              where (t1.StartTime > t2.StartTime and t1.StartTime < t2.EndTime)
              or (t1.EndTime > t2.StartTime and t1.EndTime < t2.EndTime)
              or (t1.StartTime < t2.StartTime and t1.EndTime > t2.EndTime)

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LVL 1

Author Closing Comment

by:clintnash
ID: 33638666
Short of a missing ) at the end, this query returns the correct results. Thanks to each of your for your help this morning.
0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 33638677
did you try mine? did it not work?
0
 
LVL 1

Author Comment

by:clintnash
ID: 33639633
Angel, Actually I tried them all, the first returned two of the three rows, yours returned all four rows.  Thank you...
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