Re: get first and last row in one sql as two columns

Hi:

The window function works for me (with adding limit 1 in the end to output
only one row
needed instead of many duplicate rows).

thanks very much.

On Thu, Sep 3, 2015 at 6:51 AM, Dickson S. Guedes <listas(at)guedesoft(dot)net>
wrote:

> On Wed, Sep 02, 2015 at 07:14:40PM -0400, Tom Smith wrote:
> > 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
>
> Have you tried the window functions [1] last_value and first_value?
>
> You could use something like:
>
> SELECT first_value(col1) over (order by col1),
> last_value(col1) over (order by col1)
> FROM table;
>
> It should be as simple as that, or I miss your point.
>
>
> [1] http://www.postgresql.org/docs/current/static/functions-window.html
>
>
> []s
> --
> Dickson S. Guedes
> @guediz - http://github.com/guedes
>