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SELECT column WHERE time_type = 'Break' but only the rows that are after(below) time_type = 'Start' - Mailing list pgsql-admin

From litu16
Subject SELECT column WHERE time_type = 'Break' but only the rows that are after(below) time_type = 'Start'
Date
Msg-id 1435426999355-5855467.post@n5.nabble.com
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Responses Re: SELECT column WHERE time_type = 'Break' but only the rows that are after(below) time_type = 'Start'  (Cliff Pratt <enkiduonthenet@gmail.com>)
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))Hi all, currently Im stuck in an issue, hope some good PostgreSQL fellow
programmer could give me a hand with it. This is my table...

<http://postgresql.nabble.com/file/n5855467/screenshot.jpg>

I would like to SELECT all 'time_elapse' WHERE time_type = 'Break' but only
the rows that are after(below) the last(descendent) time_type = 'Start' and
sum them up.

So in the table above I would SELECT...

*    time_elapse                  | time_type  |  time_index
    ----------------------------+-------------+-------------
    00-00-00 01:00:00.00  |  Break       |  2.1
    00-00-00 01:00:00.00  |  Break       |  2.2*

So totalbreak = 00-00-00 02:00:00.000

I know how to convert character varying to timestamp in order to sum them
up, But I don't know how would be the syntax to select all possible 'Breaks'
and sum them up (lets say the max Breaks between each 'Start' is nine).

I can hardly imagine a way to do that, so I would like to ask for
suggestions.

Thanks Advanced.



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