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From: nzanella@cs.mun.ca
To: pgsql-general@postgresql.org
Subject: AS operator and subselect result names: PostgreSQL vs. Oracle
Date: 31 Oct 2003 20:44:19 -0800
Message-ID: <b68d2f19.0310312044.3c98da8d@posting.google.com> (raw)

Hello,

I would like to ask the about the following...

PostgreSQL allows tables resulting from subselects to be renamed with
an optional AS keyword whereas Oracle 9 will report an error whenever
a table is renamed with the AS keyword. Furthermore, in PostgreSQL
when the result of a subselect is referenced in an outer select
it is required that the subselect result be named, whereas this
is not true in Oracle. I wonder what standard SQL has to say
about these two issues. In particular:

1. Does standard SQL allow an optional AS keyword for (re/)naming
   tables including those resulting from subselects.

and

2 Why must a subselect whose fields are referenced in an outer query
  be explicitly named in PostgreSQL when it is not necessary in Oracle. 

Thanks,

Neil

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