Entity relationship diagram (ERD) is released for the latest Moodle 3.0 by Marcus Green. The ERD for Moodle 3.0 is based on “reverse engineering” the code from a fresh install of Moodle 3.0
The diagram was generated by using the reverse engineering feature of the MySQL Workbench tool using a file containing the SQL code used to install Moodle. The SQL statements were extracted from the install.xml files from each Moodle module. This was converted from XML to SQL using a utility which can be downloaded through this link.
To check out more detailed diagrams of subsections, please check out the individual components here.
Thanks Marcus Green for sharing the Entity Relationship Diagram of the latest Moodle version and keep up the hard work for Moodle Community. Best wishes from MoodleWorld team.