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For some reason the "bpchar" type name was defined nowhere in our SGML docs, although several places refer to it in passing. Give it a proper mention under Character Types. While here, also provide an explanation of how the text and varchar types relate. The previous wording seemed to be doing its best to sweep text under the rug, which doesn't seem very appropriate given its prominence in other parts of the docs. Minor rearrangements and word-smithing for clarity, too. Laurenz Albe and Tom Lane, per gripe from Yanliang Lei Discussion: https://postgr.es/m/120b3084.56b6.1833b5ffe4b.Coremail.msdnchina@163.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/.