diff --git a/django/db/backends/oracle/base.py b/django/db/backends/oracle/base.py
index 6bf2e815a7..f4b11ec327 100644
--- a/django/db/backends/oracle/base.py
+++ b/django/db/backends/oracle/base.py
@@ -51,6 +51,7 @@ from django.db.backends.signals import connection_created
 from django.db.backends.oracle.client import DatabaseClient
 from django.db.backends.oracle.creation import DatabaseCreation
 from django.db.backends.oracle.introspection import DatabaseIntrospection
+from django.db.backends.oracle.schema import DatabaseSchemaEditor
 from django.utils.encoding import force_bytes, force_text
 from django.utils import six
 from django.utils import timezone
@@ -571,6 +572,10 @@ class DatabaseWrapper(BaseDatabaseWrapper):
                    and x.code == 2091 and 'ORA-02291' in x.message:
                     six.reraise(utils.IntegrityError, utils.IntegrityError(*tuple(e.args)), sys.exc_info()[2])
                 six.reraise(utils.DatabaseError, utils.DatabaseError(*tuple(e.args)), sys.exc_info()[2])
+    
+    def schema_editor(self):
+        "Returns a new instance of this backend's SchemaEditor"
+        return DatabaseSchemaEditor(self)
 
 
 class OracleParam(object):
diff --git a/django/db/backends/oracle/creation.py b/django/db/backends/oracle/creation.py
index d9bf3dfea2..c4dc80503c 100644
--- a/django/db/backends/oracle/creation.py
+++ b/django/db/backends/oracle/creation.py
@@ -17,7 +17,7 @@ class DatabaseCreation(BaseDatabaseCreation):
 
     data_types = {
         'AutoField':                    'NUMBER(11)',
-        'BooleanField':                 'NUMBER(1) CHECK (%(qn_column)s IN (0,1))',
+        'BooleanField':                 'NUMBER(1)',
         'CharField':                    'NVARCHAR2(%(max_length)s)',
         'CommaSeparatedIntegerField':   'VARCHAR2(%(max_length)s)',
         'DateField':                    'DATE',
@@ -30,10 +30,10 @@ class DatabaseCreation(BaseDatabaseCreation):
         'BigIntegerField':              'NUMBER(19)',
         'IPAddressField':               'VARCHAR2(15)',
         'GenericIPAddressField':        'VARCHAR2(39)',
-        'NullBooleanField':             'NUMBER(1) CHECK ((%(qn_column)s IN (0,1)) OR (%(qn_column)s IS NULL))',
+        'NullBooleanField':             'NUMBER(1)',
         'OneToOneField':                'NUMBER(11)',
-        'PositiveIntegerField':         'NUMBER(11) CHECK (%(qn_column)s >= 0)',
-        'PositiveSmallIntegerField':    'NUMBER(11) CHECK (%(qn_column)s >= 0)',
+        'PositiveIntegerField':         'NUMBER(11)',
+        'PositiveSmallIntegerField':    'NUMBER(11)',
         'SlugField':                    'NVARCHAR2(%(max_length)s)',
         'SmallIntegerField':            'NUMBER(11)',
         'TextField':                    'NCLOB',
@@ -41,6 +41,13 @@ class DatabaseCreation(BaseDatabaseCreation):
         'URLField':                     'VARCHAR2(%(max_length)s)',
     }
 
+    data_type_check_constraints = {
+        'BooleanField': '%(qn_column)s IN (0,1)',
+        'NullBooleanField': '(%(qn_column)s IN (0,1)) OR (%(qn_column)s IS NULL)',
+        'PositiveIntegerField': '"%(qn_column)s" >= 0',
+        'PositiveSmallIntegerField': '"%(qn_column)s" >= 0',
+    }
+
     def __init__(self, connection):
         super(DatabaseCreation, self).__init__(connection)