Preface of the Workshop Organizers

0 Federico Piai , Donatella Firmani, Divesh Srivastava, Xin Luna Dong, Andrea de Angelis, Maurizio Mazzei, Paolo Merialdo

1http://www.inf.uniroma3.it/db/sigmod2020contest/index.html 2The detailed workshop program is available on-line at http://di2kg.dia.uniroma3.it/2020.