Name Type Location Description
user_schema_alter function core/modules/user/user.install Implements hook_schema_alter().
hook_schema_alter function core/modules/system/system.api.php Perform alterations to existing database schemas.
comment_schema_alter function core/modules/comment/comment.install Implements hook_schema_alter().
EntityReferenceBehaviorHandler::schema_alter function core/modules/entityreference/plugins/behavior/EntityReferenceBehaviorHandler.inc Alter the field schema.
EntityReferenceBehaviorHandlerInterface::schema_alter function core/modules/entityreference/plugins/behavior/EntityReferenceBehaviorHandler.inc Alter the field schema.