- https://www.edx.org/es/learn/relational-databases/stanford-university-databases-semistructured-data
- https://www.edx.org/es/learn/databases/stanford-university-databases-modeling-and-theory
- https://www.edx.org/es/learn/sql/stanford-university-databases-advanced-topics-in-sql
- https://www.edx.org/es/learn/databases/stanford-university-databases-olap-and-recursion