need some explanation

[sergey lakantarov]

so i have this table-

SELECT color FROM my_db.books;
+---------+
| color |
+---------+
| Gopal |
| Manisha |
| Javed |
+---------+
3 rows in set (0.00 sec)

and i saw some syntax online, and i tested it, and its working-

SELECT abcd.``1234.e.color FROM my_db.books;
+---------+
| color |
+---------+
| Gopal |
| Manisha |
| Javed |
+---------+
3 rows in set (0.00 sec)

and this also-

SELECT color FROM my_db 123.e.books;
+---------+
| color |
+---------+
| Gopal |
| Manisha |
| Javed |
+---------+
3 rows in set (0.00 sec)

why it works?