5 rows in set

MySQL> select a1.* from a a1 right join (select max(id) id from a group by name) a2 on a1.id = a2.id where a1
.id is not null;
+----+------+--------------+
| id | name | descri       |
+----+------+--------------+
|  3 | a3   | 我是a3       |
|  4 | a1   | 我是第二个a1 |
|  5 | a2   | 我是第二个a2 |
+----+------+--------------+
3 rows in set