Defina números como um campo varchar e compare no MySQL
Vamos primeiro criar uma tabela:
mysql> create table DemoTable
-> (
-> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-> StudentScore varchar(100)
-> );
Query OK, 0 rows affected (0.66 sec)
Insira alguns registros na tabela usando o comando insert:
mysql> insert into DemoTable(StudentScore) values('90');
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable(StudentScore) values('100');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(StudentScore) values('56');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable(StudentScore) values('98');
Query OK, 1 row affected (0.13 sec)
Exiba todos os registros da tabela usando a instrução select -;
mysql> select *from DemoTable;
Saída
+-----------+--------------+
| StudentId | StudentScore |
+-----------+--------------+
| 1 | 90 |
| 2 | 100 |
| 3 | 56 |
| 4 | 98 |
+-----------+--------------+
4 rows in set (0.00 sec)
Aqui está a consulta para comparar nos campos varchar:
mysql> select *from DemoTable where CAST(StudentScore AS SIGNED) > 91;
Saída
+-----------+--------------+
| StudentId | StudentScore |
+-----------+--------------+
| 2 | 100 |
| 4 | 98 |
+-----------+--------------+
2 rows in set (0.00 sec)