OSCommerce Database Schema ERD Version 2.3.3 PDF Form

Understanding database schema using DB tools is difficult, I have reverse engineering the database and created schema diagram in PDF form. 

Tables related to different concepts (products, orders, customers, etc.) are organized together to make it easy to understand.

You can download from: https://googledrive.com/host/0B6HHzxRHWnHlZDFhODExMmYtMTlmMC00YWI1LTgyODMtZjVmOTM2NDZiNjkz/OSCommerce Database Schema V 2.3.3.pdf