title: Trying to migrate in Django 1.9 -- strange SQL error "django.db.utils.OperationalError: near ")": syntax error"
body: <p>I don't have a clue what's causing this error.  It appears to be a bug that there isn't a fix for.  Could anyone tell give me a hint as to how I might get around this?  It's frustrating me to no end.  Thanks.</p>
  
  <pre><code>Operations to perform:
    Apply all migrations: admin, contenttypes, optilab, auth, sessions
  Running migrations:
    Rendering model states... DONE
    Applying optilab.0006_auto_20160621_1640...Traceback (most recent call last):
    File "manage.py", line 10, in &lt;module&gt;
      execute_from_command_line(sys.argv)
    File "C:\Python27\lib\site-packages\django\core\management\__init__.py", line 353, in execute_from_command_line
      utility.execute()
    File "C:\Python27\lib\site-packages\django\core\management\__init__.py", line 345, in execute
      self.fetch_command(subcommand).run_from_argv(self.argv)
    File "C:\Python27\lib\site-packages\django\core\management\base.py", line 348, in run_from_argv
      self.execute(*args, **cmd_options)
    File "C:\Python27\lib\site-packages\django\core\management\base.py", line 399, in execute
      output = self.handle(*args, **options)
    File "C:\Python27\lib\site-packages\django\core\management\commands\migrate.py", line 200, in handle
      executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
    File "C:\Python27\lib\site-packages\django\db\migrations\executor.py", line 92, in migrate
      self._migrate_all_forwards(plan, full_plan, fake=fake, fake_initial=fake_initial)
    File "C:\Python27\lib\site-packages\django\db\migrations\executor.py", line 121, in _migrate_all_forwards
      state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
    File "C:\Python27\lib\site-packages\django\db\migrations\executor.py", line 198, in apply_migration
      state = migration.apply(state, schema_editor)
    File "C:\Python27\lib\site-packages\django\db\migrations\migration.py", line 123, in apply
      operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
    File "C:\Python27\lib\site-packages\django\db\migrations\operations\fields.py", line 121, in database_forwards
      schema_editor.remove_field(from_model, from_model._meta.get_field(self.name))
    File "C:\Python27\lib\site-packages\django\db\backends\sqlite3\schema.py", line 247, in remove_field
      self._remake_table(model, delete_fields=[field])
    File "C:\Python27\lib\site-packages\django\db\backends\sqlite3\schema.py", line 197, in _remake_table
      self.quote_name(model._meta.db_table),
    File "C:\Python27\lib\site-packages\django\db\backends\base\schema.py", line 110, in execute
      cursor.execute(sql, params)
    File "C:\Python27\lib\site-packages\django\db\backends\utils.py", line 79, in execute
      return super(CursorDebugWrapper, self).execute(sql, params)
    File "C:\Python27\lib\site-packages\django\db\backends\utils.py", line 64, in execute
      return self.cursor.execute(sql, params)
    File "C:\Python27\lib\site-packages\django\db\utils.py", line 95, in __exit__
      six.reraise(dj_exc_type, dj_exc_value, traceback)
    File "C:\Python27\lib\site-packages\django\db\backends\utils.py", line 64, in execute
      return self.cursor.execute(sql, params)
    File "C:\Python27\lib\site-packages\django\db\backends\sqlite3\base.py", line 323, in execute
      return Database.Cursor.execute(self, query, params)
  django.db.utils.OperationalError: near ")": syntax error
  </code></pre>
  
  <p>Here's the contents of 0006_auto_20160621_1640.py</p>
  
  <pre><code># -*- coding: utf-8 -*-
  
  # Generated by Django 1.9.6 on 2016-06-21 22:40
  from __future__ import unicode_literals
  
  from django.db import migrations
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('optilab', '0005_test'),
      ]
  
      operations = [
          migrations.RemoveField(
              model_name='lasersubstrate',
              name='substrate_ptr',
          ),
          migrations.RemoveField(
              model_name='waveguidesubstrate',
              name='substrate_ptr',
          ),
          migrations.DeleteModel(
              name='LaserSubstrate',
          ),
          migrations.DeleteModel(
              name='WaveguideSubstrate',
          ),
      ]
  </code></pre>
  
  <p>Here's the SQL produced from running 'python manage.py sqlmigrate optilab 0006'</p>
  
  <pre><code>BEGIN;
  --
  -- Remove field substrate_ptr from lasersubstrate
  --
  ALTER TABLE "optilab_lasersubstrate" RENAME TO "optilab_lasersubstrate__old";
  CREATE TABLE "optilab_lasersubstrate" ("substrate_ptr_id" integer NOT NULL PRIMARY KEY REFERENCES "optilab_substrate" ("id"));
  INSERT INTO "optilab_lasersubstrate" () SELECT  FROM "optilab_lasersubstrate__old";
  DROP TABLE "optilab_lasersubstrate__old";
  --
  -- Remove field substrate_ptr from waveguidesubstrate
  --
  ALTER TABLE "optilab_waveguidesubstrate" RENAME TO "optilab_waveguidesubstrate__old";
  CREATE TABLE "optilab_waveguidesubstrate" ("substrate_ptr_id" integer NOT NULL PRIMARY KEY REFERENCES "optilab_substrate" ("id"));
  INSERT INTO "optilab_waveguidesubstrate" () SELECT  FROM "optilab_waveguidesubstrate__old";
  DROP TABLE "optilab_waveguidesubstrate__old";
  --
  -- Delete model LaserSubstrate
  --
  DROP TABLE "optilab_lasersubstrate";
  --
  -- Delete model WaveguideSubstrate
  --
  DROP TABLE "optilab_waveguidesubstrate";
  
  COMMIT;
  </code></pre>