Khashan, E.A., El Desouky, A.I. and Elghamrawy, S.M. 2020. A Framework for Executing Complex Querying for Relational and NoSQL Databases (CQNS). European Journal of Electrical Engineering and Computer Science. 4, 5 (Sep. 2020). DOI:https://doi.org/10.24018/ejece.2020.4.5.195.