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SQL Query - Oracle 10g - Subract date from next data row

Posted on 2016-11-03
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Last Modified: 2016-11-07
Experts,
I need some help with a query I need to populate a report.
I have data that looks like this:
JOB        START TIME
TASK1   02/11/2016 09:00
TASK2   02/11/2016 09:06
TASK3   02/11/2016 09:08
END      02/11/2016 09:12

Each row has a JobID and a start time. The end time needs to be the start time of the next Job.
My goal is to add a column that contains the total task time
JOB        START TIME        TOTAL TIME
TASK1   02/11/2016 09:00   6.0
TASK2   02/11/2016 09:06   2.0
TASK3   02/11/2016 09:08   4.0
END      02/11/2016 09:12

Obviously I need to subtract Task1 from Task2 to get the time, but how can I write a query that looks at the next row?
any guidance is greatly appreciated.
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Question by:JDCam
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4 Comments
 
LVL 77

Accepted Solution

by:
slightwv (䄆 Netminder) earned 500 total points
ID: 41872166
LEAD allows you to peak at the next row.

If you want the results in minutes try this:
select job, start_time, (lead(start_time) over(order by start_time)-start_time) * 1440
from yourtable;

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Author Comment

by:JDCam
ID: 41872230
Sounds great. I will read up on and try it out.
I assume it considers any order by clause to determine what the next row is.
Thanks
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LVL 77

Expert Comment

by:slightwv (䄆 Netminder)
ID: 41872235
>>I assume it considers any order by clause to determine what the next row is.

Nope.  It uses the ORDER BY inside the LEAD call.
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Author Closing Comment

by:JDCam
ID: 41877074
Works Great Thanks
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