SELECT column WHERE time_type = 'Break' but only the rows that are after(below) time_type = 'Start'

))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.

--
View this message in context: http://postgresql.nabble.com/SELECT-column-WHERE-time-type-Break-but-only-the-rows-that-are-after-below-time-type-Start-tp5855467.html
Sent from the PostgreSQL - admin mailing list archive at Nabble.com.