3 files changed, 1 insertions, 5 deletions
diff --git a/django/db/backends/mysql/schema.py b/django/db/backends/mysql/schema.py
index 2ac287328b..31829506c1 100644
--- a/django/db/backends/mysql/schema.py
+++ b/django/db/backends/mysql/schema.py
@@ -56,8 +56,6 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
 
     def quote_value(self, value):
         self.connection.ensure_connection()
-        if isinstance(value, str):
-            value = value.replace("%", "%%")
         # MySQLdb escapes to string, PyMySQL to bytes.
         quoted = self.connection.connection.escape(
             value, self.connection.connection.encoders
diff --git a/django/db/backends/oracle/schema.py b/django/db/backends/oracle/schema.py
index aca6d83962..0d70522a2a 100644
--- a/django/db/backends/oracle/schema.py
+++ b/django/db/backends/oracle/schema.py
@@ -32,7 +32,7 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
         elif isinstance(value, datetime.timedelta):
             return "'%s'" % duration_iso_string(value)
         elif isinstance(value, str):
-            return "'%s'" % value.replace("'", "''").replace("%", "%%")
+            return "'%s'" % value.replace("'", "''")
         elif isinstance(value, (bytes, bytearray, memoryview)):
             return "'%s'" % value.hex()
         elif isinstance(value, bool):
diff --git a/django/db/backends/postgresql/schema.py b/django/db/backends/postgresql/schema.py
index 18899a6a2b..40fef6660e 100644
--- a/django/db/backends/postgresql/schema.py
+++ b/django/db/backends/postgresql/schema.py
@@ -56,8 +56,6 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
     )
 
     def quote_value(self, value):
-        if isinstance(value, str):
-            value = value.replace("%", "%%")
         return sql.quote(value, self.connection.connection)
 
     def _field_indexes_sql(self, model, field):