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It is not clear how the implicit condition of FOR PORTION OF should interact with the use of a cursor. Normally, we forbid combining WHERE CURRENT OF with other WHERE conditions. The SQL standard only includes FOR PORTION OF with <update statement: searched> and <delete statement: searched>, not <update statement: positioned> or <delete statement: positioned>, so it is easy for us to exclude the functionality, at least for now. Author: Paul A. Jungwirth <pj@illuminatedcomputing.com> Discussion: https://www.postgresql.org/message-id/flat/CA%2BrenyUEKPexUYsH4qeU8_o1jqKsUkEWca1keS6n21shgG1g%2BA%40mail.gmail.com
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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.