Re: Postgres and alias

Hi Daniel,

> On 27. Aug, 2020, at 17:55, Fontana Daniel C (Desartec S.R.L.) <desartecsrl(at)gmail(dot)com> wrote:
>
> Hi, I am migrating a database from Sybase to PostgreSql 12.
>
> This select in sybase works for me, but with postgresql it accuses me
> "THERE IS NO COLUMN ls_numero"
>
> select '1234567890' as ls_number,
> substr (ls_number, 3, 3);
>
> Is it possible to get information from an alias in postgresql? how would the
> code be?

try this:

postgres=# select ls_number, substr (ls_number, 3, 3) from (select '1234567890' as ls_number) a;
ls_number | substr
------------+--------
1234567890 | 345
(1 row)

Cheers,
Paul