the group by in mysql5.7 - mysql

Question

I find the same sql run in mysql5.7 and mysql5.5 but the result is different.
the sql like this:
SELECT t2.* FROM (SELECT t1.* FROM t_user t1 ORDER BY t1.id desc) AS t2 GROUP BY t2.type;
The result in mysql5.7:
The result in mysql5.5:
the sql script like this:
DROP TABLE IF EXISTS `t_user`;
CREATE TABLE `t_user` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`name` varchar(255) DEFAULT NULL,
`phone` varchar(255) DEFAULT NULL,
`gender` varchar(255) DEFAULT NULL,
`type` varchar(255) DEFAULT NULL,
`birth` datetime DEFAULT NULL,
`is_delete` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=101 DEFAULT CHARSET=utf8;
INSERT INTO `t_user` VALUES ('1', 'James', '0594-5397864', '0', '3', '2016-01-30 19:01:09', '1');
INSERT INTO `t_user` VALUES ('2', 'Hayes', '0594-5392419', '1', '4', '2015-12-24 11:12:27', '1');
INSERT INTO `t_user` VALUES ('3', 'Diana', '0594-5393520', '1', '5', '2016-03-21 13:03:50', '0');
INSERT INTO `t_user` VALUES ('4', 'Rajah', '0594-5399812', '1', '4', '2015-11-26 02:11:35', '0');
INSERT INTO `t_user` VALUES ('5', 'Daria', '0594-5397571', '0', '4', '2016-01-18 11:01:11', '1');
INSERT INTO `t_user` VALUES ('6', 'Lee', '0594-5394539', '1', '1', '2015-10-23 08:10:23', '1');
INSERT INTO `t_user` VALUES ('7', 'Cameran', '0594-5392867', '0', '4', '2016-11-16 12:11:08', '0');
INSERT INTO `t_user` VALUES ('8', 'Wylie', '0594-5395349', '0', '5', '2017-07-06 04:07:27', '0');
INSERT INTO `t_user` VALUES ('9', 'Bertha', '0594-5395287', '1', '1', '2017-02-08 12:02:45', '1');
INSERT INTO `t_user` VALUES ('10', 'Fletcher', '0594-5399246', '0', '4', '2015-09-03 20:09:33', '0');
INSERT INTO `t_user` VALUES ('11', 'Conan', '0594-5391546', '1', '5', '2017-05-15 09:05:23', '0');
INSERT INTO `t_user` VALUES ('12', 'Raymond', '0594-5399666', '0', '3', '2015-10-20 05:10:05', '1');
INSERT INTO `t_user` VALUES ('13', 'Noel', '0594-5397392', '1', '4', '2017-05-26 03:05:56', '0');
INSERT INTO `t_user` VALUES ('14', 'Miriam', '0594-5399081', '0', '2', '2016-05-21 02:05:09', '0');
INSERT INTO `t_user` VALUES ('15', 'Maya', '0594-5397242', '0', '3', '2016-10-24 02:10:50', '1');
INSERT INTO `t_user` VALUES ('16', 'Winifred', '0594-5395142', '1', '1', '2017-03-15 02:03:43', '0');
INSERT INTO `t_user` VALUES ('17', 'Elaine', '0594-5398478', '1', '3', '2017-03-08 15:03:03', '1');
INSERT INTO `t_user` VALUES ('18', 'Robert', '0594-5397830', '0', '5', '2016-02-10 22:02:06', '0');
INSERT INTO `t_user` VALUES ('19', 'Patrick', '0594-5396516', '0', '4', '2015-09-10 07:09:51', '0');
INSERT INTO `t_user` VALUES ('20', 'Darrel', '0594-5397417', '0', '1', '2016-03-11 11:03:36', '0');
INSERT INTO `t_user` VALUES ('21', 'Salvador', '0594-5399732', '1', '3', '2016-01-01 15:01:21', '0');
INSERT INTO `t_user` VALUES ('22', 'Brandon', '0594-5396204', '1', '4', '2016-05-12 06:05:40', '1');
INSERT INTO `t_user` VALUES ('23', 'Dorothy', '0594-5396783', '0', '1', '2016-12-12 10:12:59', '1');
INSERT INTO `t_user` VALUES ('24', 'Kevyn', '0594-5398240', '0', '2', '2016-02-07 04:02:14', '1');
INSERT INTO `t_user` VALUES ('25', 'Brody', '0594-5398774', '1', '1', '2016-12-11 20:12:36', '0');
what cause this different... my English is poor,LOL...

Answer 1

MySQL is too liberal when it comes to data integrity and its default settings often allow you to accomplish data loss without a complaint (see reference for ONLY_FULL_GROUP_BY SQL mode). For instance, it allows incomplete GROUP BY clauses like yours and just picks an arbitrary (not even random) result.
You need to rewrite your query so all columns involved fit into one category:
Be part of an aggregate expression in the SELECT clause:
SELECT MAX(foo) AS maximum_foo
Be part of the GROUP BY clause:
SELECT foo
...
GROUP BY foo
This way you are being specific enough so the result-set is deterministic. Your current code is basically: "Give me one user of each type"—but you don't specify any criteria to pick users. Other DBMSs (Oracle, SQL Server) will complaint: "You didn't say how to choose users". MySQL will merely pick an arbitrary user (but not even a random user, because randomness would imply that chosen users follow a rule, which is not the case). The ONLY_FULL_GROUP_BY SQL mode is just a way to make MySQL behave like other engines.
You can also get rid of your subquery, it really serves no purpose.

Answer 2

No order on outer SELECT causes the difference. However what do you want to achieve? Take only one (which one) from each group (type) or what?
SELECT *
FROM t_user
WHERE id IN (SELECT MAX(id) FROM t_user GROUP BY type)
ORDER BY type
SQL fiddle link