MySQL automatic conversion on lowercase? Is this possible?

Yes, it is possible with triggers. You can create trigger for automatic conversion on lower case. Let us first create a table −

mysql> create table DemoTable
   (
   StudentSubject text
   );
Query OK, 0 rows affected (0.61 sec)

Let us create a trigger for automatic conversion on lower case −

mysql> CREATE TRIGGER lowerCaseOnInsertDemo BEFORE INSERT ON DemoTable FOR EACH ROW
   SET NEW.StudentSubject = LOWER(NEW.StudentSubject);
Query OK, 0 rows affected (0.21 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('MOngoDb');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable values('JaVA');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values('MySqL');
Query OK, 1 row affected (0.15 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output displaying the converted lowercase values −

+----------------+
| StudentSubject |
+----------------+
| mongodb        |
| java           |
| mysql          |
+----------------+
3 rows in set (0.00 sec)