Solved

Summation of datetime fields

Posted on 2011-02-15
9
406 Views
Last Modified: 2012-05-11
In SQL, how would I sum these values together to get total hours? The total should be about 18.09 hours.

Sample data:
SEG_START                            SEG_END
2011.01.05 00:40:00      2011.01.05 04:50:00
2011.01.05 04:50:00      2011.01.05 07:00:00
2011.01.05 07:00:00      2011.01.05 08:00:00
2011.01.05 08:00:00      2011.01.05 09:00:00
2011.01.05 09:00:00      2011.01.05 10:00:00
2011.01.05 10:00:00      2011.01.05 11:00:00
2011.01.05 11:00:00      2011.01.05 12:00:00
2011.01.05 12:00:00      2011.01.05 13:00:00
2011.01.05 13:00:00      2011.01.05 14:00:00
2011.01.05 14:00:00      2011.01.06 18:45:00
0
Comment
Question by:wdelaney05
  • 3
  • 3
  • 3
9 Comments
 
LVL 28

Accepted Solution

by:
Naveen Kumar earned 250 total points
ID: 34903601
if there are no gaps in the times for all the records, then try this :

select (max(seg_end) - min(seg_start) ) * 24 from your_table
0
 
LVL 28

Expert Comment

by:Naveen Kumar
ID: 34903610
the output given by the query will be in hours.
0
 
LVL 73

Expert Comment

by:sdstuber
ID: 34903651
assuming your values are strings then try this...

select sum(24 * (to_date(seg_end,'yyyy.mm.dd hh24:mi:ss')  - to_date(seg_start,'yyyy.mm.dd hh24:mi:ss')))  from yourtable


note, your total is 42.0833333333 hours because your last row is 28.75 hours

if you change the date to 2011.01.05 then it will come out to 18.0833333333
0
 
LVL 73

Assisted Solution

by:sdstuber
sdstuber earned 250 total points
ID: 34903654
if your values are dates, you can skip the "to_date" portion and simply sum the difference * 24
0
Zoho SalesIQ

Hassle-free live chat software re-imagined for business growth. 2 users, always free.

 

Author Comment

by:wdelaney05
ID: 34903671
both of you are correct, thanks! I just took the time to test out all comments.
I tried select (max(seg_end) - min(seg_start) ) * 24
and I also tried SUM(((seg_end - seg_start) * 24))

0
 

Author Comment

by:wdelaney05
ID: 34903673
and yup, sdstuber, my values are dates.
0
 
LVL 28

Expert Comment

by:Naveen Kumar
ID: 34903695
Good and thanks.
0
 
LVL 73

Expert Comment

by:sdstuber
ID: 34903730
note the max-min  method is only valid if the start/end are contiguous

if there are any holes then you'll need to sum the individual pieces
0
 

Author Comment

by:wdelaney05
ID: 34903890
sdtuber, re: note the max-min  method is only valid if the start/end are contiguous
if there are any holes then you'll need to sum the individual pieces

Noted, thanks. My data will be contiguous, thank goodness. I have other tables with data that won't be contigous, so I'll have to keep that in mind.

Thanks again to both of you!
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This post first appeared at Oracleinaction  (http://oracleinaction.com/undo-and-redo-in-oracle/)by Anju Garg (Myself). I  will demonstrate that undo for DML’s is stored both in undo tablespace and online redo logs. Then, we will analyze the reaso…
Ever needed a SQL 2008 Database replicated/mirrored/log shipped on another server but you can't take the downtime inflicted by initial snapshot or disconnect while T-logs are restored or mirror applied? You can use SQL Server Initialize from Backup…
This video shows how to set up a shell script to accept a positional parameter when called, pass that to a SQL script, accept the output from the statement back and then manipulate it in the Shell.
This video shows information on the Oracle Data Dictionary, starting with the Oracle documentation, explaining the different types of Data Dictionary views available by group and permissions as well as giving examples on how to retrieve data from th…

895 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now