A. Greubel, T. Rudolph, and M. Hennecke. VeraSQL: An educational client for relational databases. 18. Fachtagung Bildungstechnologien (DELFI), 2020. N. Pöhner, T. Schmidt, A. Greubel, M. Hennecke, and M. Ehmann. BlocklySQL: A new block-based editor for SQL. Proceedings of the 14th Workshop in Primary and Secondary Computing Education, ACM, pages 4:1-4:2, 2019.