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get first and last row in one sql as two columns - Mailing list pgsql-general

From	Tom Smith
Subject	get first and last row in one sql as two columns
Date	September 3, 2015 02:14:46
Msg-id	CAKwSVFEjy_q+gCPAri_q40tFx4ZUiLG6BaY+o9A69HXbH7FCPg@mail.gmail.com Whole thread Raw
Responses	Re: get first and last row in one sql as two columns Re: get first and last row in one sql as two columns Re: get first and last row in one sql as two columns
List	pgsql-general

Hi:

I need to get the first and last tow in one sql like below

select first(col1), last(col1) from table order by col1

I saw some posting in wiki with a custom function (or C extention)

to do this. Is it widely used and reliable?
https://wiki.postgresql.org/wiki/First/last_(aggregate)

I am wondering why these two functions are not part of postgresql built-in

functions as it has many use cases

Thanks

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