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Editorial Team
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Asked: 2026-06-13T06:02:40+00:00

First let me apologize if this doesn’t make any sense. I took me some

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First let me apologize if this doesn’t make any sense. I took me some time to write it up and understand it myself. I apologize if there is anything that is confusing. I am new to this and did my best to explain. I also apologize for the qustion title, if it doesn’t represent. If someone knows of a better title, please edit or make any changes necessary.

I have two tables JOBS and PHASES.

JOBS
Id
Job_Type (ex. 0 = import)
Title

PHASES
Id
Jobs_Id
Phase_Type
Title
Start_Time
End_Time
Duration

Each job/job_type can have any number of phases – each phase has a start, end, and duration time

I want to select the fields jobs_id, start_time, end_time, and duration from the PHASES table
and add up all their Durations for each job_type (example: job_type = 0 which is an import job)

SELECT jobs_id, start_time, end_time, duration FROM phases 
JOIN jobs ON phase.jobs_id = jobs.id
WHERE jobs.job_type=0

return jobs_id
return the earlist start time as start
return the lastest endtime as end
return the total duration of them all TotalDuration

Example, if the following data was in the JOBS table (Id, Job_Type, Title)

1, 0, Import

and the following data was in PHASES table (id, job_id, phase_type, title, start, end, duration)

1, 1, 1, 0, Run Preprocessor, 10/18/2012 8:52 PM, 10/18/2012 9:00 PM, 00:08:00
2, 1, 2, 1, Massage Data, 10/18/2012 9:00 PM, 10/18/2012 9:05 PM, 00:05:00
3, 1, 3, 2, Run Postprocessor, 10/18/2012 9:05 PM, 10/18/2012 9:07 PM, 00:02:00

4, 2, 1, 0, Run Preprocessor, 10/18/2012 9:15 PM, 10/18/2012 9:20 PM, 00:05:00
5, 2, 2, 1, Massage Data, 10/18/2012 9:20 PM, 10/18/2012 9:25 PM, 00:05:00
6, 2, 3, 2, Run Postprocessor, 10/18/2012 9:30 PM, 10/18/2012 9:35 PM, 00:05:00

Above shows the imformation (phases) of two jobs (job_type = 0)

I need an SQL statement that can combine the phases and show the earlist start and latest end, and the total duration. I would expect this information returned (Job_id, Start, End, TotalDuration)

 1, 10/18/2012 8:52 PM, 10/18/2012 9:07 PM, 00:05:00
 2, 10/18/2012 9:15 PM, 10/18/2012 9:35 PM, 00:15:00
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1 Answer

  1. Editorial Team

    Assuming your total durations will not go beyond 1 day, this will work. If it goes beyond one day, an additional expression will be required to preceed the HH:MM:SS in the duration column.

    select job_id,
       min(start_time) start_time,
       max(end_time) end_time,
       CONVERT(CHAR(8), max(end_time)-min(start_time), 8) totalduration
  from phases
 group by job_id

-- sample data --
create table phases (job_id int, start_time datetime, end_time datetime);
insert phases values (1, '20121019 12:45', '20121019 13:15');
insert phases values (1, '20121019 13:15', '20121019 13:45');
insert phases values (1, '20121019 14:00', '20121019 15:12');

-- result --
job_id  start_time               end_time                 totalduration
1       2012-10-19 12:45:00.000  2012-10-19 15:12:00.000  02:27:00
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