- id: int
 - name: varchar (100)
 - mark: varchar (100)
 - price: double

1, keyboard, mark1, 10
2, mouse, mark2, 15
3, keyboard, mark3, 50
4, computer, mark4, 120
5, mouse, mark5, 90

1, keyboard, mark1, 50
2, mouse, mark2, 90
4, computer, mark4, 120

SELECT * FROM machine GROUP BY name