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David Johnston pointed out that the original text here had been obsoleted by SQL:2008, which allowed ORDER BY in subqueries. We could weaken the text to describe ORDER-BY-in-subqueries as an optional SQL feature that's possibly unportable; but then the exact same statements would apply to the alternative it's being compared to (ORDER-BY-in-aggregate-calls). So really that would be pretty useless; let's just take out the sentence entirely. Instead, point out the hazard that any extra processing in the upper query might cause the subquery output order to be destroyed. Discussion: <CAKFQuwbAX=iO9QbpN7_jr+BnUWm9FYX8WbEPUvG0p+nZhp6TZg@mail.gmail.com> |
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PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.