## 28.1.2 Linking Tables (cont.)

- Add a unique field - primary key

Customer
Customer_ Number | Name | Address | City | State | Zip
--- | --- | --- | --- | --- | ---
`INTEGER` | `CHAR(40)` | `CHAR(40)` | `CHAR(30)` | `CHAR(2)` | `CHAR(10)`
3175 | Sam's Small Appliances | 100 Main St. | Anytown | CA | 98765
3176 | Electronics Unlimited | 1175 Liberty Ave. | Pleasantville | MI | 45066

prev |top |next