SQL Backup query with where statement

Create Table Stu_Table( Stu_Id int, Stu_Name varchar(15),Stu_Class());

insert into stu_table values(1, 'Komal',10);
insert into stu_table values(2, 'Ajay',10);
insert into stu_table values(3, 'Santosh',10);
insert into stu_table values(4, 'Rakesh',10);
insert into stu_table values(5, 'Bhau',10);

insert into stu_table values(1, 'aaa',11);
insert into stu_table values(2, 'bbb',11);
insert into stu_table values(3, 'ccc',11);
insert into stu_table values(4, 'ddd',11);
insert into stu_table values(5, 'eee',11);

insert into stu_table values(1, 'iii',12);
insert into stu_table values(2, 'jjj',12);
insert into stu_table values(3, 'kkk',12);
insert into stu_table values(4, 'lll',12);
insert into stu_table values(5, 'mmm',12);

+--------+----------+-----------+
| Stu_Id | Stu_Name | Stu_Class |
+--------+----------+-----------+
| 1      | Komal    | 10        |
| 2      | Ajay     | 10        |
| 3      | Santosh  | 10        |
| 4      | Rakesh   | 10        |
| 5      | Bhau     | 10        |
| 1      | aaa      | 11        |
| 2      | bbb      | 11        |
| 3      | ccc      | 11        |
| 4      | ddd      | 11        |
| 5      | eee      | 11        |
| 1      | iii      | 12        |
| 2      | jjj      | 12        |
| 3      | kkk      | 12        |
| 4      | lll      | 12        |
| 5      | mmm      | 12        |
+--------+----------+-----------+

create table stu_table_10_backup( select * from stu_table where stu_class=10);

+--------+----------+-----------+
| Stu_Id | Stu_Name | Stu_Class |
+--------+----------+-----------+
| 1      | Komal    | 10        |
| 2      | Ajay     | 10        |
| 3      | Santosh  | 10        |
| 4      | Rakesh   | 10        |
| 5      | Bhau     | 10        |
+--------+----------+-----------+