mysql链表数据存储查询排序问题

mysql数据表中的原始数据结构：

-- ------------------------------ Table structure for asort-- ----------------------------DROP TABLE IF EXISTS `asort`;CREATE TABLE `asort`  (  `from` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,  `to` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,  `mark` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;-- ------------------------------ Records of asort-- ----------------------------INSERT INTO `asort` VALUES ('START', 'A', '');INSERT INTO `asort` VALUES ('A', 'B', '');INSERT INTO `asort` VALUES ('A', 'F', 'FALSE');INSERT INTO `asort` VALUES ('F', 'B', 'RETURN');INSERT INTO `asort` VALUES ('B', 'C', '');INSERT INTO `asort` VALUES ('C', 'D', '');INSERT INTO `asort` VALUES ('C', 'G', 'FALSE');INSERT INTO `asort` VALUES ('G', 'D', 'RETURN');INSERT INTO `asort` VALUES ('D', 'H', 'FALSE');INSERT INTO `asort` VALUES ('H', 'D', 'RETURN');INSERT INTO `asort` VALUES ('D', 'E', '');INSERT INTO `asort` VALUES ('E', 'END', '');INSERT INTO `asort` VALUES ('E', 'I', 'FALSE');INSERT INTO `asort` VALUES ('I', 'END', 'RETURN');

如何实现如下查询排序结果：