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

One way would be to use a SELECT in a WHERE clause:

SELECT SUM(<column_that_you_want_to_sum>) FROM <your_table> WHERE (SELECT
<column_that_you_want_to_select_on> >
MAX(<field_that_you_want_to_compare_against>);

Something along those lines should work.

Cheers,

Cliff

On Sun, Jun 28, 2015 at 5:43 AM, litu16 <litumelendez(at)gmail(dot)com> wrote:

> ))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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