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Peter Eisentraut dfb75e478c Add primary keys and unique constraints to system catalogs 
For those system catalogs that have a unique indexes, make a primary
key and unique constraint, using ALTER TABLE ... PRIMARY KEY/UNIQUE
USING INDEX.

This can be helpful for GUI tools that look for a primary key, and it
might in the future allow declaring foreign keys, for making schema
diagrams.

The constraint creation statements are automatically created by
genbki.pl from DECLARE_UNIQUE_INDEX directives.  To specify which one
of the available unique indexes is the primary key, use the new
directive DECLARE_UNIQUE_INDEX_PKEY instead.  By convention, we
usually make a catalog's OID column its primary key, if it has one.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/dc5f44d9-5ec1-a596-0251-dadadcdede98@2ndquadrant.com
 		2021-01-30 19:44:29 +01:00
config Update copyright for 2021 2021-01-02 13:06:25 -05:00
contrib postgres_fdw: Fix tests for CLOBBER_CACHE_ALWAYS. 2021-01-30 10:12:22 +09:00
doc doc: Clarify status of SELECT INTO on reference page 2021-01-30 11:21:32 +01:00
src Add primary keys and unique constraints to system catalogs 2021-01-30 19:44:29 +01:00
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README 

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/.