ER Diagram · ERDUniversity schema (academic ERD) — ER Diagram
Classic textbook schema with Student / Course / Enrollment associative entity and labelled relationships — the canonical Elmasri & Navathe ch.3 example.
النوع ERDالمعيار Chen 1976 / Everest 1976 (crow's foot)المحرّك schematex-erdآخر تحديث 27/5/2026