Re: Select Distinct Order By Array_Position

"David G. Johnston" <[email protected]> Mon, 26 Nov 2018 13:06:46 -0700

Newsgroups	gmane.comp.db.postgresql.sql
Message-ID	<CAKFQuwa6=d3_BuGQd8sq44bvO0922VNTZGgdk8h_JTaEcpNSYQ@mail.gmail.com>

On Mon, Nov 26, 2018 at 12:58 PM Mark Williams <[email protected]> wrote:
>
> Wasn’t aware it was possible to put array_position statement in the actual select or is this a select within a select?

Easy enough to try either way

> Also, I am selecting from an ordered (randomly) subset of data and I need to return the result set in the same order so do have to output the array as part of the order by?

Not sure what the question is...

Anyway, maybe this will be helpful:

SELECT vals.*
FROM (VALUES (1::integer),(2),(3),(4),(5)) vals (v),
LATERAL unnest(ARRAY[3,1,5]::integer[]) with ordinality AS spec (s, o)
WHERE v = s
ORDER BY o

David J.