I am looking for ER diagram of magento 1.9.x so that i can understand magento database flow and table-relationships. if anyone can provide me COMPLETE ER diagram that will really help me. Like i saw a good er diagram of prestashop but could not find such diagram of magento.
Update: For ER Diagram of Magento 2.1.3 check https://magento.stackexchange.com/a/152061/29175 . Thanks to efforts of @Anna Völkl