select request_id from notification_requests where type_id = :type_id and user_id = :user_id and object_id = :object_id select count(*) from notification_requests where type_id = :type_id and object_id = :object_id select count(*) from notification_requests where type_id = :type_id and object_id = :object_id select user_id from notification_requests where type_id = :type_id and object_id = :object_id select request_id from notification_requests where type_id = :type_id and object_id = :object_id