diff --git a/django/contrib/gis/db/backends/postgis/introspection.py b/django/contrib/gis/db/backends/postgis/introspection.py
index 97fa7480e6..9b4458efea 100644
--- a/django/contrib/gis/db/backends/postgis/introspection.py
+++ b/django/contrib/gis/db/backends/postgis/introspection.py
@@ -19,26 +19,6 @@ class PostGISIntrospection(DatabaseIntrospection):
         'raster_overviews',
     ]
 
-    # Overridden from parent to include raster indices in retrieval.
-    # Raster indices have pg_index.indkey value 0 because they are an
-    # expression over the raster column through the ST_ConvexHull function.
-    # So the default query has to be adapted to include raster indices.
-    _get_indexes_query = """
-        SELECT DISTINCT attr.attname, idx.indkey, idx.indisunique, idx.indisprimary
-        FROM pg_catalog.pg_class c, pg_catalog.pg_class c2, pg_catalog.pg_index idx,
-            pg_catalog.pg_attribute attr, pg_catalog.pg_type t
-        WHERE
-            c.oid = idx.indrelid
-            AND idx.indexrelid = c2.oid
-            AND attr.attrelid = c.oid
-            AND t.oid = attr.atttypid
-            AND (
-                attr.attnum = idx.indkey[0] OR
-                (t.typname LIKE 'raster' AND idx.indkey = '0')
-            )
-            AND attr.attnum > 0
-            AND c.relname = %s"""
-
     def get_postgis_types(self):
         """
         Return a dictionary with keys that are the PostgreSQL object
diff --git a/django/db/backends/postgresql/introspection.py b/django/db/backends/postgresql/introspection.py
index 859282057a..a24e37b0b8 100644
--- a/django/db/backends/postgresql/introspection.py
+++ b/django/db/backends/postgresql/introspection.py
@@ -29,16 +29,6 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
 
     ignored_tables = []
 
-    _get_indexes_query = """
-        SELECT attr.attname, idx.indkey, idx.indisunique, idx.indisprimary
-        FROM pg_catalog.pg_class c, pg_catalog.pg_class c2,
-            pg_catalog.pg_index idx, pg_catalog.pg_attribute attr
-        WHERE c.oid = idx.indrelid
-            AND idx.indexrelid = c2.oid
-            AND attr.attrelid = c.oid
-            AND attr.attnum = idx.indkey[0]
-            AND c.relname = %s"""
-
     def get_field_type(self, data_type, description):
         field_type = super().get_field_type(data_type, description)
         if description.default and 'nextval' in description.default: