Preface These are the Proceedings of the Workshops co-located with the 23rd International Conference on Extending Database Technology and the 23rd International Conference on Database Theory, 30th March-2nd April 2020, Copenhagen, Denmark. The EDBT/ICDT 2020 joint conference and all of its Workshops took place fully online due to the global coronavirus pandemic. The workshops chair, organisers, presenters, and online attendees express their gratitude to the Conference Officers, Executive Board and local organisation teams in making possible the online workshops under the challenging circumstances faced world-wide. Alexandra Poulovassilis EDBT/ICDT 2020 Workshops Chair BigVis 2020 Programme Committee James Abello, Rutgers University, USA Demosthenes Akoumianakis, Hellenic Mediterranean University, Greece Gennady Andrienko, Fraunhofer, Germany Rick Cole, Tableau Alfredo Cuzzocrea, University of Trieste, Italy Danyel Fisher, Honeycomb.io Steffen Frey, University of Stuttgart, Germany Giorgos Giannopoulos, ATHENA Research Center, Greece Parke Godfrey, University of York, Canada Michael Gubanov, University of Texas at San Antonio, USA Silu Huang, Microsoft Christophe Hurter, Ecole Nationale de l’Aviation Civile, France Stefan Jänicke, University of Southern Denmark, Denmark Vana Kalogeraki, Athens University of Economics & Business, Greece Eser Kandogan, IBM James Klosowski, AT&T Research Manolis Koubarakis, University of Athens, Greece Zhicheng Liu, Adobe Steffen Lohmann, Fraunhofer, Germany Ioana Manolescu, INRIA & Ecole Polytechnique, France Marios Meimaris, ATHENA Research Center, Greece Silvia Miksch, Vienna University of Technology, Austria Davide Mottin, Aarhus University, Denmark Martin Nöllenburg, Vienna University of Technology, Austria Olga Papaemmanouil, Brandeis University, USA Paul Parsons, Purdue University, USA Laura Po, Unimore, Italy Giuseppe Polese, University of Salerno, Italy Alexander Rind, St. Pölten University of Applied Sciences, Austria Gerik Scheuermann, University of Leipzig, Germany Hans-Jörg Schulz, Aarhus University, Denmark Heidrun Schumann, University of Rostock, Germany Tobias Schreck, Graz University of Technology, Austria Michael Sedlmair, University of Stuttgart, Germany Thibault Sellam, Columbia University, USA Bettina Speckmann, Eindhoven University of Technology, Netherlands Kostas Stefanidis, University of Tampere, Finland Cagatay Turkay, City University London, UK Panos Vassiliadis, University of Ioannina, Greece Chaoli Wang, University of Notre Dame, USA Junpeng Wang, Visa Research Kai Xu, Middlesex University, UK Panpan Xu, Bosch Research Hongfeng Yu, University of Nebraska-Lincoln, USA BMDA 2020 Programme Committee Andrienko Gennady, Fraunhofer Institute IAIS, Germany Artikis Alexander, NCSR Demokritos, Greece Dallachiesa Michele, Università degli Studi di Trento, Italy Baskiotis Nicolas, LIP6/UPMC, France Georgiou Harris, University of Piraeus, Greece Doulkeridis Christos, University of Piraeus, Greece Katzouris Nikos, NCSR Demokritos, Greece Nanni Mirco, HISTI-CNR, Pisa, Italy Patroumpas Kostas, IMIS, Athena Research Center, Greece Raffaeta' Alessandra, Universita' Ca' Foscari Venezia, Italy Ray Cyril, Naval Academy Research Institute, France Palpanas Themis, Paris Descartes University, France Soares Amilcar, Dalhousie University, Canada Tampakis Panagiotis, University of Piraeus, Greece Tserpes Konstantinos, Harokopio University of Athens, Greece Weibel Robert, University of Zurich, Switzerland Zeinalipour-Yazti Demetrios, University of Cyprus, Cyprus Zissis Dimitris, University of Aegean, Greece DARLI-AP 2020 Programme Committee Daniele Apiletti, Politecnico di Torino, Italy Khalid Belhajjame, University Paris Dauphine, France Agnese Chiatti, The Open University, UK Alfredo Cuzzocrea, University of Trieste, Italy Elena Daraio, Politecnico di Torino, Italy Javier A. Espinosa, Delft University of Technology, Netherlands Alessandro Fiori, Candiolo Cancer Institute - FPO IRCCS, Italy Patrick Marcel, Université François Rabelais Tours, France Sara Migliorini, Università degli Studi di Verona, Italy Kjetil Norvag, Norwegian University of Science and Technology, Norway Stefano Proto, Politecnico di Torino, Italy Elisa Quintarelli, Università degli Studi di Verona, Italy Simona E. Rombo, Università degli studi di Palermo, Italy Paolo Soda, Università Campus Bio-Medico di Roma, Italy Domenico Ursino, Università Politecnica delle Marche, Italy Jose Luis Zechinelli Martini, Universidad de las Américas, Mexico ETLMP 2020 Programme Committee Sihem Amer-Yahia, CNRS, France Vassilis Christophides, University of Crete, Greece and Institute for Advanced Studies, Cergy France Joao Comba, UFRGS, Brazil Yanlei Diao, Ecole Polytechnique, France Dimitrios Gunopulos, National and Kapodistrian University of Athens, Greece Thomas Liebig, Materna Information and Communications SE, Germany Adrian Mos, NAVER LABS Europe, France Nico Piatkowski, TU Dortmund, Germany Eric Simon, SAP, France Divesh Srivastava, AT&T Labs, USA Thibaut Thonet, NAVER LABS Europe, France Ioannis Tsamardinos, University of Crete, Greece PIE Programme Committee Francesco Amigoni, Politecnico di Milano, Italy Elena Baralis, Politecnico di Torino, Italy H. V. Jagadish, University of Michigan, USA Matteo Lissandrini, Aalborg University, Denmark Ioana Manolescu, INRIA, France Davide Martinenghi, Politecnico di Milano, Italy Tova Milo, Tel Aviv University, Israel Paolo Papotti, Eurecom Evaggelia Pitoura, University of Ioannina, Greece Elisa Quintarelli, Università di Verona, Italy Guglielmo Tamburrini, Universita' di Napoli Federico II, Italy Tommaso Teofili, Roma Tre University, Italy Ernest Teniente, Universitat Politècnica de Catalunya, Spain Yannis Velegrakis, Utrecht University, Netherlands SEA Data 2020 Programme Committee Manos Athanassoulis, Boston University, USA Nikolaus Augsten, University of Salzburg, Austria Hamdi Ben Hamadou, Aalborg University, Denmark Sonia Bergamaschi, University of Modena and Reggio Emilia, Italy Nikos Bikakis, University of Ioannina, Greece Gautam Das, University of Texas at Arlington, USA Anastasia Dimou, Ghent University, Belgium Laura Di Rocco, Northeastern University, USA Daniele Foroni, Huawei Johan-Christoph Freytag, Humboldt University Berlin, Germany Paul Groth, University of Amsterdam, Netherlands Francesco Guerra, University of Modena and Reggio Emilia, Italy Christian S. Jensen, Aalborg University, Denmark Panos Karras, Aarhus University, Denmark Arijit Khan, Nanyang Technological University, Singapore Haridimos Kondylakis, Foundation of Research & Technology-Hellas, Greece Georgia Koutrika, Athena Research Center, Greece Ioana Manolescu, INRIA, France Renée Miller, Northeastern University, USA Felix Naumann, Hasso Plattner Institute, Germany Themis Palpanas, Paris Descartes University, France Paolo Papotti, EURECOM Giulia Preti, University of Trento, Italy Petra Selmer, Neo4j Gianmaria Silvello, University of Padua, Italy Giovanni Simonini, University of Modena and Reggio Emilia, Italy Paolo Sottovia, Huawei Fabian Suchanek, Télécom Paris University, France Letizia Tanca, Politecnico di Milano, Italy Daniel Ting, Tableau Riccardo Torlone, University Roma Tre, Italy Aikaterini Tzompanaki, University of Cergy-Pontoise, France Cong Yu, Google Kostas Zoumpatianos, Harvard University, USA