Database Systems for Advanced Applications 24th International Conference, DASFAA 2019, Chiang Mai, Thailand, April 22-25, 2019, Proceedings, Part II - Li, Guoliang; Li, Guoliang; Yang, Jun; Yang, Jun; Gama, Joao; Gama, Joao; Natwichai, Juggapong; Natwichai, Juggapong; Tong, Yongxin; Tong, Yongxin (Springer International Publishing : Imprint: Springer, 2019)