8. প্রাইম্াসর সি (Primary key)
Product Id Product Name Unit Price
01 TV 21000
02 Fan 2400
Product
9. িবরে সি (Foreign key)
Product Id Product Name Unit Price
01 TV 21000
02 Fan 2400
Invoice Id Customer Id Product Id Date
8801 2525 002 20/6/17
8802 2526 001 21/6/2017
Invoice