python manage.py validate -- Checks for any errors in the construction of your models.
python manage.py sqlcustom polls -- Outputs any custom SQL statements (such as table modifications or constraints) that are defined for the application.
python manage.py sqlclear polls -- Outputs the necessary DROP TABLE statements for this app, according to which tables already exist in your database (if any).
python manage.py sqlindexes polls -- Outputs the CREATE INDEX statements for this app.
python manage.py sqlall polls -- A combination of all the SQL from the sql, sqlcustom, and sqlindexes commands.