Insertion of data into multiple table using primary key and foreign key through html form with php procedual and mysql

Question

I am new to complicated databases. I want to add supplier detail I the database, which has 3 tables with name product, supplier, and purchase invoice.

product have an id(primary key), product_name, and supplier_name(foreign key)

A supplier have a supplier_name and supplier_detail

and purchase invoice have reference_no#(primary key) product_id(foreign key) product_price product_quantity amount_paid and purchase_date

I want to add detail in database using php form but how could I? I am confusing with multiple table and foreign key.

Need suggestion as well as answer with source code? And also I want to know is database I have created is correct or not?

Answer 1

I honestly would recommend you start reading first about relations in databases.

This would help you a lot .