Fixed #21031 -- Updated schema migrations FAQ.

If I make changes to a model, how do I update the database?

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Take a look at Django's support for :mod:`schema migrations

<django.db.migrations>`.

If you don't mind clearing data, your project's ``manage.py`` utility has a

:djadmin:`flush` option to reset the database to the state it was in

immediately after :djadmin:`syncdb` was executed.

If you do care about deleting data, you'll have to execute the ``ALTER TABLE``

statements manually in your database.

There are `external projects which handle schema updates

<http://www.djangopackages.com/grids/g/database-migration/>`_, of which the current

defacto standard is `south <http://south.aeracode.org/>`_.

Do Django models support multiple-column primary keys?

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