Fixed #19461 - Linked to psycopg in topics/install.txt

In addition to a database backend, you'll need to make sure your Python

database bindings are installed.

* If you're using PostgreSQL, you'll need the ``postgresql_psycopg2`` package.

* If you're using PostgreSQL, you'll need the `postgresql_psycopg2`_ package.

  You might want to refer to our :ref:`PostgreSQL notes <postgresql-notes>` for

  further technical details specific to this database.

  If you're on Windows, check out the unofficial `compiled Windows version`_.

* If you're using MySQL, you'll need the ``MySQL-python`` package, version 1.2.1p2 or higher. You

  will also want to read the database-specific :ref:`notes for the MySQL

  backend <mysql-notes>`.

* If you're using MySQL, you'll need the ``MySQL-python`` package, version

  1.2.1p2 or higher. You will also want to read the database-specific

  :ref:`notes for the MySQL backend <mysql-notes>`.

* If you're using Oracle, you'll need a copy of cx_Oracle_, but please

  read the database-specific :ref:`notes for the Oracle backend <oracle-notes>`

``ALTER TABLE`` privileges during ``syncdb`` but won't issue

``ALTER TABLE`` statements on a table once ``syncdb`` has created it.

If you're using Django's :doc:`testing framework</topics/testing>` to test database queries,

Django will need permission to create a test database.

If you're using Django's :doc:`testing framework</topics/testing>` to test

database queries, Django will need permission to create a test database.

.. _PostgreSQL: http://www.postgresql.org/

.. _MySQL: http://www.mysql.com/

.. _psycopg: http://initd.org/pub/software/psycopg/

.. _postgresql_psycopg2: http://initd.org/psycopg/

.. _compiled Windows version: http://stickpeople.com/projects/python/win-psycopg/

.. _SQLite: http://www.sqlite.org/

.. _pysqlite: http://trac.edgewall.org/wiki/PySqlite