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Tom Lane 1f66c657f2 Doc: document that we expect CHECK constraint conditions to be immutable. 
This restriction is implicit in the check-only-once implementation we use
for table and domain constraints, but it wasn't spelled out anywhere, nor
was there any advice about how to alter a constraint's behavior safely.
Improve that.

I was also dissatisfied with the documentation of ALTER DOMAIN VALIDATE
CONSTRAINT, which entirely failed to explain the use of that feature; and
thence decided that ALTER TABLE VALIDATE CONSTRAINT could be documented
better as well.

Perhaps we should back-patch this, along with the related commit 36d442a25,
but for now I refrained.

Discussion: https://postgr.es/m/12539.1544107316@sss.pgh.pa.us
 		2018-12-07 16:40:58 -05:00
config Update config/ax_pthread.m4 to latest upstream version. 2018-11-19 15:05:33 -05:00
contrib Fix some errhint and errdetail strings missing a period 2018-12-07 07:47:42 +09:00
doc Doc: document that we expect CHECK constraint conditions to be immutable. 2018-12-07 16:40:58 -05:00
src In PQprint(), write HTML table trailer before closing the output pipe. 2018-12-07 13:11:30 -05:00
.dir-locals.el Update documentation editor setup instructions 2018-07-13 21:23:41 +02:00
.gitattributes Remove contrib/tsearch2. 2017-02-13 11:06:11 -05:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
COPYRIGHT Update copyright for 2018 2018-01-02 23:30:12 -05:00
GNUmakefile.in Remove unwanted "garbage cleanup" logic in Makefiles. 2018-08-08 14:32:29 -04:00
HISTORY Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
Makefile Fix non-GNU makefiles for AIX make. 2017-11-30 00:57:22 -08:00
README Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
README.git Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
aclocal.m4 Fix configure's AC_CHECK_DECLS tests to work correctly with clang. 2018-11-19 12:01:47 -05:00
configure Update config/ax_pthread.m4 to latest upstream version. 2018-11-19 15:05:33 -05:00
configure.in Postpone LLVM-related uses of AC_CHECK_DECLS. 2018-11-19 12:43:20 -05:00

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/.