Thread: BUG #18542: Order by expression, that contains column from projection isn't working
BUG #18542: Order by expression, that contains column from projection isn't working
From
PG Bug reporting form
Date:
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
Re: BUG #18542: Order by expression, that contains column from projection isn't working
From
Tom Lane
Date:
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