mysql> create table test(bla varchar(255) not null);
Query OK, 0 rows affected (0.10 sec)

mysql> insert into test values(1.1), (2.1), (3.1);
Query OK, 3 rows affected (0.00 sec)
Records: 3  Duplicates: 0  Warnings: 0

mysql> select * from test;
+-------------------------------------------------------+
| bla                                                   |
+-------------------------------------------------------+
| 1.100000000000000088817841970012523233890533447265625 |
| 2.100000000000000088817841970012523233890533447265625 |
| 3.100000000000000088817841970012523233890533447265625 |
+-------------------------------------------------------+
3 rows in set (0.00 sec)