Re: strange evaluation Window function and SRF functions?

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От David Johnston
Тема Re: strange evaluation Window function and SRF functions?
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Msg-id EDEC968F-78D5-43ED-8E35-0B9DC08B61B9@yahoo.com
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Ответ на Re: strange evaluation Window function and SRF functions?  (Thom Brown <thom@linux.com>)
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On Jul 30, 2012, at 12:33, Thom Brown <thom@linux.com> wrote:

On 30 July 2012 17:19, Pavel Stehule <pavel.stehule@gmail.com> wrote:
Hello

I seen nice trick based on window function http://stackoverflow.com/questions/11700930/how-can-i-trim-a-text-array-in-postgresql

but isn't it example of wrong evaluation? Result of row_number is not correct

Looks right to me.  I guess the way to get the row_number they're after out of the result set would involve changing OVER () to OVER (ORDER BY unnest(myTextArrayColumn))


The better way would be to perform the unnest in a sub-select then attach the row number in the outer select.

David J.

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