Re: Window ?

From: "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>
To: Olivier Leprêtre <o(dot)lepretre(at)gmail(dot)com>
Cc: pgsql-sql <pgsql-sql(at)lists(dot)postgresql(dot)org>
Subject: Re: Window ?
Date: 2018-06-13 14:54:45
Message-ID: CAKFQuwY2E1GUmOoNDo-UdxiOSg4gErdpmzDYV5zRJ6JhBO60Uw@mail.gmail.com
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On Wed, Jun 13, 2018 at 7:33 AM, Olivier Leprêtre <o(dot)lepretre(at)gmail(dot)com>
wrote:

>
> I want to convert records into lines,
>
>
>
> 1 att1 att2 att3 att4
>
> 2 att5 att6 ...
>
>
>
​I would recommend either an actual array (array_agg function) or a
structured string (string_agg function)

SELECT road, array_agg(colA ORDER BY seg)
FROM tbl
GROUP BY road;

Otherwise you will need a output 31 columns with unused columns holding
null. You can do that brute-force or you can leverage the tablefunc
extension's crosstab function.

https://www.postgresql.org/docs/10/static/tablefunc.html

David J.
​

In response to

  • Window ? at 2018-06-13 14:33:50 from Olivier Leprêtre

Responses

  • RE: Window ? at 2018-06-13 15:14:45 from Olivier Leprêtre

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