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Documenting INCLUDE in the section about unique indexes is confusing, as complained of by Emilio Platzer. Furthermore, it entirely failed to explain why you might want to use the feature. The section about index-only scans is really the right place; it already talked about making such things the hard way. Rewrite that text to describe INCLUDE as the normal way to make a covering index. Also, move that section up a couple of places, as it now seems more important than some of the stuff we had before it. It still has to be after expression and partial indexes, since otherwise some of it would involve forward references. Discussion: https://postgr.es/m/154031939560.30897.14677735588262722042@wrigleys.postgresql.org |
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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: 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/.