mirror of
https://git.postgresql.org/git/postgresql.git
synced 2025-01-12 18:34:36 +08:00
04db9d25d1
DROP CONSTRAINT This form drops constraints on a table. Currently, constraints on tables are not required to have unique names, so there may be more than one constraint matching the specified name. All matching constraints will be dropped. To my knowledge, it is no longer possible to create constraints with the same name for the same relation. When you create a constraint and specify the same name explictly, an error is raised. Implicit constraint creation won't choose an existing name either and up to now you could not rename a constraint. Renaming works with the patch I sent in a few hours ago but this patch as well won't allow constraints with identical names on the same relation. The attached patch thus removes the note in the docs. Joachim Wieland |
||
---|---|---|
config | ||
contrib | ||
doc | ||
src | ||
aclocal.m4 | ||
configure | ||
configure.in | ||
COPYRIGHT | ||
GNUmakefile.in | ||
Makefile | ||
README | ||
README.CVS |
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. The JDBC, ODBC, C++, Python, and Tcl interfaces have been moved to the PostgreSQL Projects Web Site at http://gborg.postgresql.org for separate maintenance. A Perl DBI/DBD driver is available from CPAN. 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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 ftp://ftp.postgresql.org/pub/. For more information look at our web site located at http://www.postgresql.org/.