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POSQL to combine child records by joining parent record
 

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    <p>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.</p> <p>I have two tables JOBS and PHASES.</p> <pre><code>JOBS Id Job_Type (ex. 0 = import) Title PHASES Id Jobs_Id Phase_Type Title Start_Time End_Time Duration </code></pre> <p>Each job/job_type can have any number of phases - each phase has a start, end, and duration time</p> <p>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)</p> <pre><code>SELECT jobs_id, start_time, end_time, duration FROM phases JOIN jobs ON phase.jobs_id = jobs.id WHERE jobs.job_type=0 </code></pre> <p>return jobs_id return the earlist start time as start return the lastest endtime as end return the total duration of them all TotalDuration</p> <p>Example, if the following data was in the JOBS table (Id, Job_Type, Title)</p> <pre><code>1, 0, Import </code></pre> <p>and the following data was in PHASES table (id, job_id, phase_type, title, start, end, duration)</p> <pre><code>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 </code></pre> <p>Above shows the imformation (phases) of two jobs (job_type = 0)</p> <p>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)</p> <pre><code> 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 </code></pre>
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    1. This table or related slice is empty.
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    1. USRichardTheKiwi
    1. USBlow ThemUp
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      1. POSQL to combine child records by joining parent record
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    2. VO
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    1. COsql-server, mysql, nosql, oracle, sqlite, postgresql?
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      1. USRichardTheKiwi
    2. CONeed it to work for Oracle, MS SQL Server, and Firebird - but it would be nice if it could work accross all databases using ANSI SQL
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    3. COThat won't happen because differencing dates and/or display in HH:MM:SS are *both* non-standard operations. There is no equivalent statement to do either aspect on all 3 of those DBMS.
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