TU Wien Informatics

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Sebastian Skritek

Senior Lecturer Dipl.-Ing. Dr.techn.

Research Focus

  • Logic and Computation: 100%

Research Areas

  • Semantic Web, Database Theory, Databases

Role

Contact

2024W

2025S

 

2023

  • Diversity of Answers to Conjunctive Queries (extended Abstract) / Merkl, T. C., Pichler, R., & Skritek, S. (2023). Diversity of Answers to Conjunctive Queries (extended Abstract). In B. Kimelfeld, M. V. Martinez, & R. Angles (Eds.), Proceedings of the 15th Alberto Mendelzon International Workshop on Foundations of Data Management (AMW 2023). https://doi.org/10.34726/5393
    Download: Paper (228 KB)
    Projects: DeConquer (2023–2027) / KnowledgeGraph (2020–2028) / SustainGraph (2023–2025)
  • Diversity of Answers to Conjunctive Queries / Merkl, T. C., Pichler, R., & Skritek, S. (2023). Diversity of Answers to Conjunctive Queries. In F. Geerts & B. Vandevoort (Eds.), 26th International Conference on Database Theory (pp. 10:1-10:19). Schloss Dagstuhl – Leibniz-Zentrum für Informatik GmbH, Dagstuhl Publishing. https://doi.org/10.4230/LIPICS.ICDT.2023.10
    Download: Paper (771 KB)
    Project: HyperTrac (2018–2022)

2020

2019

2018

2017

  • On the Complexity of Hard Enumeration Problems / Creignou, N., Kröll, M., Pichler, R., Skritek, S., & Vollmer, H. (2017). On the Complexity of Hard Enumeration Problems. In Language and Automata Theory and Applications - 11th International Conference, LATA 2017 (pp. 183–195). http://hdl.handle.net/20.500.12708/57056
    Projects: FAIR (2013–2018) / HINT (2012–2017)

2016

  • The Challenge of Optional Matching in SPARQL / Ahmetaj, S., Fischl, W., Kröll, M., Pichler, R., Šimkus, M., & Skritek, S. (2016). The Challenge of Optional Matching in SPARQL. In M. Gyssens & G. R. Simari (Eds.), Foundations of Information and Knowledge Systems 9th International Symposium, FoIKS 2016, Linz, Austria, March 7-11, 2016. Proceedings (pp. 169–190). Lecture Notes in Computer Science (LNCS) / Springer. https://doi.org/10.1007/978-3-319-30024-5_10
    Projects: HINT (2012–2017) / SEE (2012–2016)
  • On the Complexity of Enumerating the Answers to Well-designed Pattern Trees / Kröll, M., Pichler, R., & Skritek, S. (2016). On the Complexity of Enumerating the Answers to Well-designed Pattern Trees. In W. Martens & T. Zeume (Eds.), 19th International Conference on Database Theory, ICDT 2016, Bordeaux, France, March 15-18, 2016 (pp. 22:1-22:18). Schloss Dagstuhl - Leibniz-Zentrum fuer Informatik. https://doi.org/10.4230/LIPIcs.ICDT.2016.22
    Projects: HINT (2012–2017) / SEE (2012–2016)
  • On the Complexity of Enumerating the Answers to Well-Designed Pattern Trees / Kröll, M., Pichler, R., & Skritek, S. (2016). On the Complexity of Enumerating the Answers to Well-Designed Pattern Trees. In R. Pichler & A. S. da Silva (Eds.), Proceedings of the 10th Alberto Mendelzon International Workshop on Foundations of Data Management, Panama City, Panama, May 8-10, 2016 (p. 5). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/56490
    Projects: HINT (2012–2017) / SEE (2012–2016)

2015

  • Towards Reconciling SPARQL and Certain Answers / Ahmetaj, S., Fischl, W., Pichler, R., Šimkus, M., & Skritek, S. (2015). Towards Reconciling SPARQL and Certain Answers. In A. Gangemi, L. Stefano, & A. Panconesi (Eds.), Proceedings of the 24th International Conference on World Wide Web. ACM. https://doi.org/10.1145/2736277.2741636
    Projects: HINT (2012–2017) / SEE (2012–2016)
  • Efficient Evaluation and Approximation of Well-designed Pattern Trees / Barcelo, P., Pichler, R., & Skritek, S. (2015). Efficient Evaluation and Approximation of Well-designed Pattern Trees. In T. Milo & D. Calvanese (Eds.), Proceedings of the 34th ACM SIGMOD-SIGACT-SIGAI  Symposium on Principles of Database Systems. ACM. https://doi.org/10.1145/2745754.2745767
    Projects: HINT (2012–2017) / SEE (2012–2016)
  • Towards Reconciling SPARQL and Certain Answers (Extended Abstract) / Ahmetaj, S., Fischl, W., Pichler, R., Simkus, M., & Skritek, S. (2015). Towards Reconciling SPARQL and Certain Answers (Extended Abstract). In A. Cali & M.-E. Vidal (Eds.), Proceedings of the 9th Alberto Mendelzon International Workshop on Foundations of Data Management, Lima, Peru, May 6 - 8, 2015 (p. 6). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/56096
    Projects: HINT (2012–2017) / SEE (2012–2016)
  • Efficient Evaluation of Well-designed Pattern Trees (Extended Abstract) / Barceló, P., Pichler, R., & Skritek, S. (2015). Efficient Evaluation of Well-designed Pattern Trees (Extended Abstract). In A. Cali & M.-E. Vidal (Eds.), Proceedings of the 9th Alberto Mendelzon International Workshop on Foundations of Data Management, Lima, Peru, May 6 - 8, 2015 (p. 6). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/56095
    Projects: HINT (2012–2017) / SEE (2012–2016)
  • DL-Lite and Conjunctive Queries Extended by Optional Matching / Ahmetaj, S., Fischl, W., Pichler, R., Simkus, M., & Skritek, S. (2015). DL-Lite and Conjunctive Queries Extended by Optional Matching. In D. Calvanese & B. Konev (Eds.), Proceedings of the 28th International Workshop on Description Logics, Athens,Greece, June 7-10, 2015 (p. 4). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/56094
    Projects: HINT (2012–2017) / SEE (2012–2016)

2014

  • Benchmarking Database Systems for Graph Pattern Matching / Pobiedina, N., Rümmele, S., Skritek, S., & Werthner, H. (2014). Benchmarking Database Systems for Graph Pattern Matching. In Database and Expert Systems Applications 25th International Conference, DEXA 2014, Munich, Germany, September 1-4, 2014. Proceedings, Part I (pp. 226–241). Springer Verlag. https://doi.org/10.1007/978-3-319-10073-9_18
    Project: SEE (2012–2016)
  • Containment and equivalence of well-designed SPARQL / Pichler, R., & Skritek, S. (2014). Containment and equivalence of well-designed SPARQL. In R. Hull & M. Grohe (Eds.), Proceedings of the 33rd ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems. ACM. https://doi.org/10.1145/2594538.2594542
    Project: SEE (2012–2016)
  • On the Hardness of Counting the Solutions of SPARQL Queries / Pichler, R., & Skritek, S. (2014). On the Hardness of Counting the Solutions of SPARQL Queries. In G. Gottlob & J. Perez (Eds.), Proceedings of the 8th Alberto Mendelzon Workshop on Foundations of Data Management (p. 6). CEUR-WS. http://hdl.handle.net/20.500.12708/55783
    Project: SEE (2012–2016)

2013

  • Tractable counting of the answers to conjunctive queries / Pichler, R., & Skritek, S. (2013). Tractable counting of the answers to conjunctive queries. Journal of Computer and System Sciences, 79(6), 984–1001. https://doi.org/10.1016/j.jcss.2013.01.012
    Projects: SODI (2009–2013) / TTPC (2008–2012)
  • Static Analysis and Optimization of Semantic Web Queries / Letelier, A., Pérez, J., Pichler, R., & Skritek, S. (2013). Static Analysis and Optimization of Semantic Web Queries. ACM Transactions on Database Systems, 38(4), 1–45. https://doi.org/10.1145/2500130
    Projects: SEE (2012–2016) / SODI (2009–2013) / TTPC (2008–2012)
  • Complexity of redundancy detection on RDF graphs in the presence of rules, constraints, and queries / Pichler, R., Polleres, A., Skritek, S., & Woltran, S. (2013). Complexity of redundancy detection on RDF graphs in the presence of rules, constraints, and queries. Semantic Web: Interoperability, Usability, Applicability, 4(4), 351–393. http://hdl.handle.net/20.500.12708/155572
    Projects: SODI (2009–2013) / TTPC (2008–2012)
  • Peer Data Management / Roth, A., & Skritek, S. (2013). Peer Data Management. In P. G. Kolaitis, M. Lenzerini, & N. Schweikardt (Eds.), Data Exchange, Integration, and Streams (pp. 185–215). Schloss Dagstuhl - Leibniz-Zentrum fuer Informatik, Germany. https://doi.org/10.4230/DFU.Vol5.10452.185
    Projects: SEE (2012–2016) / SODI (2009–2013) / TTPC (2008–2012)
  • Foundational aspects of Semantic Web optimization : new algorithms and complexity results / Skritek, S. (2013). Foundational aspects of Semantic Web optimization : new algorithms and complexity results [Dissertation, Technische Universität Wien]. reposiTUm. http://hdl.handle.net/20.500.12708/159695
  • Efficient Updates of Uncertain Databases / Hubmer, A., Pichler, R., Savenkov, V., & Skritek, S. (2013). Efficient Updates of Uncertain Databases. In L. Bravo & M. Lenzerini (Eds.), Proceedings of the 7th Alberto Mendelzon International Workshop on Foundations of Data Management Puebla/Cholula, Mexico, May 21-23, 2013 (p. 7). CEUR-WS. http://hdl.handle.net/20.500.12708/54797
    Project: HINT (2012–2017)

2012

  • SPAM: A SPARQL Analysis and Manipulation Tool / Letelier, A., Perez, J., Pichler, R., & Skritek, S. (2012). SPAM: A SPARQL Analysis and Manipulation Tool. In Z. M. Özsoyoglu (Ed.), Proceedings of the VLDB (pp. 1958–1961). http://hdl.handle.net/20.500.12708/54495
  • Foundational aspects of semantic web optimization / Skritek, S. (2012). Foundational aspects of semantic web optimization. In X. L. Dong & M. T. Özsu (Eds.), Proceedings of the on SIGMOD/PODS 2012 PhD Symposium - PhD ’12. ACM Press. https://doi.org/10.1145/2213598.2213611
  • Static analysis and optimization of semantic web queries / Letelier, A., Pérez, J., Pichler, R., & Skritek, S. (2012). Static analysis and optimization of semantic web queries. In M. Benedikt, M. Krötzsch, & M. Lenzerini (Eds.), Proceedings of the 31st symposium on Principles of Database Systems - PODS ’12. ACM. https://doi.org/10.1145/2213556.2213572
    Project: SODI (2009–2013)

2011

  • Tractable Counting of the Answers to Conjunctive Queries / Pichler, R., & Skritek, S. (2011). Tractable Counting of the Answers to Conjunctive Queries. In P. Barceló & V. Tannen (Eds.), Alberto Mendelzon International Workshop on Foundations of Data Management 2011 (p. 12). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/53692
    Project: SODI (2009–2013)
  • The Complexity of Evaluating Tuple Generating Dependencies / Pichler, R., & Skritek, S. (2011). The Complexity of Evaluating Tuple Generating Dependencies. In T. Milo (Ed.), Proceedings of the 14#^{th} International Conference on Database Theory (p. 12). ACM. http://hdl.handle.net/20.500.12708/53675
    Projects: SODI (2009–2013) / TTPC (2008–2012)

2010

  • Redundancy Elimination on RDF Graphs in the Presence of Rules, Constraints, and Queries / Pichler, R., Polleres, A., Skritek, S., & Woltran, S. (2010). Redundancy Elimination on RDF Graphs in the Presence of Rules, Constraints, and Queries. In P. Hitzler & T. Lukasiewicz (Eds.), Web Reasoning and Rule Systems (pp. 133–148). Lecture Notes/ Springer. https://doi.org/10.1007/978-3-642-15918-3_11
  • Minimising RDF Graphs under Rules and Constraints Revisited / Pichler, R., Polleres, A., Skritek, S., & Woltran, S. (2010). Minimising RDF Graphs under Rules and Constraints Revisited. In A. H. F. Laender & L. V. S. Lakshmanan (Eds.), Proceedings of the 4th Alberto Mendelzon International Workshop on Foundations of Data Management. CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/53438
  • Theory of Peer Data Management / Skritek, S. (2010). Theory of Peer Data Management. Data Exchange, Integration, and Streams (DEIS’10), Schloß Dagstuhl, Deutschland, EU. http://hdl.handle.net/20.500.12708/85055
  • Uncertain Databases in Collaborative Data Management / Pichler, R., Savenkov, V., Skritek, S., & Truong, H.-L. (2010). Uncertain Databases in Collaborative Data Management. In A. de Keijzer & M. van Keulen (Eds.), CTIT Workshop Proceedings Series (pp. 129–143). CTIT, Centre for Telematics and Information Technology. http://hdl.handle.net/20.500.12708/53505
  • Implementing a Peer Database Management System / Skritek, S., & Pichler, R. (2010). Implementing a Peer Database Management System. In H. Kaiser & R. Kirner (Eds.), Proceedings of the Junior Scientist Conference 2010 (pp. 299–300). http://hdl.handle.net/20.500.12708/53422

2009

  • Implementing a Peer Data Management System / Skritek, S. (2009). Implementing a Peer Data Management System [Diploma Thesis, Technische Universität Wien]. reposiTUm. https://resolver.obvsg.at/urn:nbn:at:at-ubtuw:1-36716
    Download: PDF (1.15 MB)

2006

  • Dynamic XML Query Table Editor / Skritek, S., Aigner, W., & Miksch, S. (2006). Dynamic XML Query Table Editor (Asgaard-TR-2006-4). http://hdl.handle.net/20.500.12708/33084

2005