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On the MERGE page, the description of the privileges required could be taken to imply that the SELECT privilege is required on all columns of the data source, whereas actually it is only required on the columns referred to by conditions or expressions in the MERGE command. Re-word it to make that a little clearer, and mention expressions as well as conditions. Also, add a glossary entry for MERGE, and nearby on the glossary page, mention MERGE in the list of commands that cannot update a materialized view. Noted by Jian He. Patch by me, reviewed by Jian He. Discussion: https://postgr.es/m/CACJufxHuSoRXKwr0MtSFLXuT2nFVWcVfEWhxg7qdP9h%2Bs3a%2BUw%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. PostgreSQL has many language interfaces, many of which are listed here: https://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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.