## Tablets

id | Name | Price | Operating_System | ScreenSize
--- | --- | --- | --- | ---
1 | iPad Pro | 899.99 | iOS | 12.9
2 | Galaxy Tab S6 | 799.99 | Android | 10.5
3 | Surface Pro 7 | 999.99 | Windows 10 | 12.3
4 | Pixel Slate | 799.99 | Chrome OS | 12.3
5 | Xiaomi Mi Pad 4 | 249.99 | Android | 8

## Laptops

id | Name | Price | Operating_System | RAM
--- | --- | --- | --- | ---
1 | MacBook Air | 999.99 | macOS | 8
2 | Dell XPS 13 | 1199.99 | Windows 10 | 16
3 | Lenovo Thinkpad T490s | 1499.99 | Windows 10 | 16
4 | HP Spectre x360 | 1299.99 | Windows 10 | 16
5 | Asus Zenbook UX333FA | 1199.99 | Windows 10 | 16

## Students

id | FirstName | LastName | Age
--- | --- | --- | ---
1 | John | Smith | 21
2 | Jane | Doe | 22
3 | Michael | Brown | 23
4 | Emily | White | 20
5 | David | Green | 24

## Classes

id | Name | TeacherId
--- | --- | ---
|  | (→ Students.id)
1 | Math | 1
2 | English | 2
3 | History | 3
4 | Biology | 4
5 | Physics | 5

## Enrollments

StudentId | ClassId | Grade
--- | --- | ---
(→ Students.id) | (→ Classes.id) |
1 | 1 | A
2 | 2 | B+
3 | 3 | C
4 | 4 | A-
5 | 5 | B

## Devices

DeviceType | OS | PurchaseDate | WarrantyPeriod
--- | --- | --- | ---
Tablet | Windows 10 | 2022-01-01 | 1
Tablet | iOS | 2022-01-01 | 1
Laptop | macOS | 2022-01-01 | 1
Laptop | Linux | 2022-01-01 | 1
Desktop | Windows 10 | 2022-01-01 | 1