Fixed #28665 -- Change some database exceptions to NotImplementedError per PEP 249.

4 files changed, 6 insertions, 6 deletions

diff --git a/django/db/backends/base/features.py b/django/db/backends/base/features.py
index 3a89cc0900..3706e12db1 100644
--- a/django/db/backends/base/features.py
+++ b/django/db/backends/base/features.py
@@ -1,5 +1,5 @@
 from django.db.models.aggregates import StdDev
-from django.db.utils import ProgrammingError
+from django.db.utils import NotSupportedError, ProgrammingError
 from django.utils.functional import cached_property
 
 
@@ -269,9 +269,9 @@ class BaseDatabaseFeatures:
         """Confirm support for STDDEV and related stats functions."""
         try:
             self.connection.ops.check_expression_support(StdDev(1))
-            return True
-        except NotImplementedError:
+        except NotSupportedError:
             return False
+        return True
 
     def introspected_boolean_field_type(self, field=None):
         """
diff --git a/django/db/backends/base/operations.py b/django/db/backends/base/operations.py
index 3517300b50..3d476b77da 100644
--- a/django/db/backends/base/operations.py
+++ b/django/db/backends/base/operations.py
@@ -579,7 +579,7 @@ class BaseDatabaseOperations:
         This is used on specific backends to rule out known expressions
         that have problematic or nonexistent implementations. If the
         expression has a known problem, the backend should raise
-        NotImplementedError.
+        NotSupportedError.
         """
         pass
 
diff --git a/django/db/backends/sqlite3/operations.py b/django/db/backends/sqlite3/operations.py
index 408848c9ad..e90cc052d0 100644
--- a/django/db/backends/sqlite3/operations.py
+++ b/django/db/backends/sqlite3/operations.py
@@ -43,7 +43,7 @@ class DatabaseOperations(BaseDatabaseOperations):
                     pass
                 else:
                     if isinstance(output_field, bad_fields):
-                        raise NotImplementedError(
+                        raise utils.NotSupportedError(
                             'You cannot use Sum, Avg, StdDev, and Variance '
                             'aggregations on date/time fields in sqlite3 '
                             'since date/time is saved as text.'
diff --git a/django/db/models/lookups.py b/django/db/models/lookups.py
index f79f435515..66945c4a1a 100644
--- a/django/db/models/lookups.py
+++ b/django/db/models/lookups.py
@@ -25,7 +25,7 @@ class Lookup:
             # a bilateral transformation on a nested QuerySet: that won't work.
             from django.db.models.sql.query import Query  # avoid circular import
             if isinstance(rhs, Query):
-                raise NotImplementedError("Bilateral transformations on nested querysets are not supported.")
+                raise NotImplementedError("Bilateral transformations on nested querysets are not implemented.")
         self.bilateral_transforms = bilateral_transforms
 
     def apply_bilateral_transforms(self, value):