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* BUG #18542: Order by expression, that contains column from projection isn't working
@ 2024-07-16 09:12 PG Bug reporting form <noreply@postgresql.org>
2024-07-16 12:45 ` Re: BUG #18542: Order by expression, that contains column from projection isn't working Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 1 reply; 2+ messages in thread
From: PG Bug reporting form @ 2024-07-16 09:12 UTC (permalink / raw)
To: pgsql-bugs@lists.postgresql.org; +Cc: ivningman@gmail.com
The following bug has been logged on the website:
Bug reference: 18542
Logged by: Aleksandr Novozhilov
Email address: ivningman@gmail.com
PostgreSQL version: 16.1
Operating system: Windows
Description:
select z as y from
(select 1 as z) x
order by y + 1
That query finishes with error:
ERROR: column "y" does not exist
Position: 48
But wrapping it with select works fine:
select * from (select z as y from
(select 1 as z) x) c
order by y + 1
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: BUG #18542: Order by expression, that contains column from projection isn't working
2024-07-16 09:12 BUG #18542: Order by expression, that contains column from projection isn't working PG Bug reporting form <noreply@postgresql.org>
@ 2024-07-16 12:45 ` Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 0 replies; 2+ messages in thread
From: Tom Lane @ 2024-07-16 12:45 UTC (permalink / raw)
To: ivningman@gmail.com; +Cc: pgsql-bugs@lists.postgresql.org
PG Bug reporting form <noreply@postgresql.org> writes:
> select z as y from
> (select 1 as z) x
> order by y + 1
> That query finishes with error:
> ERROR: column "y" does not exist
> Position: 48
> But wrapping it with select works fine:
> select * from (select z as y from
> (select 1 as z) x) c
> order by y + 1
This is not a bug. See
https://www.postgresql.org/docs/current/queries-order.html
particularly "Note that an output column name has to stand alone, that
is, it cannot be used in an expression". The fact that we allow this
at all is a hangover from SQL92; per SQL99 and later, variables in
ORDER BY should refer to input columns (that is, outputs of the FROM
clause).
regards, tom lane
^ permalink raw reply [nested|flat] 2+ messages in thread
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2024-07-16 09:12 BUG #18542: Order by expression, that contains column from projection isn't working PG Bug reporting form <noreply@postgresql.org>
2024-07-16 12:45 ` Tom Lane <tgl@sss.pgh.pa.us>
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