Zobrazeno 1 - 10
of 412
pro vyhledávání: '"Libkin, Leonid"'
SQL/PGQ and GQL are very recent international standards for querying property graphs: SQL/PGQ specifies how to query relational representations of property graphs in SQL, while GQL is a standalone language for graph databases. The rapid industrial de
Externí odkaz:
http://arxiv.org/abs/2409.01102
To answer database queries over incomplete data the gold standard is finding certain answers: those that are true regardless of how incomplete data is interpreted. Such answers can be found efficiently for conjunctive queries and their unions, even i
Externí odkaz:
http://arxiv.org/abs/2310.12694
Autor:
Szárnyas, Gábor, Bebee, Brad, Birler, Altan, Deutsch, Alin, Fletcher, George, Gabb, Henry A., Gosnell, Denise, Green, Alastair, Guo, Zhihui, Hare, Keith W., Hidders, Jan, Iosup, Alexandru, Kiryakov, Atanas, Kovatchev, Tomas, Li, Xinsheng, Libkin, Leonid, Lin, Heng, Luo, Xiaojian, Prat-Pérez, Arnau, Püroja, David, Qi, Shipeng, van Rest, Oskar, Steer, Benjamin A., Szakállas, Dávid, Tong, Bing, Waudby, Jack, Wu, Mingxi, Yang, Bin, Yu, Wenyuan, Zhang, Chen, Zhang, Jason, Zhou, Yan, Boncz, Peter
Graph data management is instrumental for several use cases such as recommendation, root cause analysis, financial fraud detection, and enterprise knowledge representation. Efficiently supporting these use cases yields a number of unique requirements
Externí odkaz:
http://arxiv.org/abs/2307.04350
Autor:
Angles, Renzo, Bonifati, Angela, Dumbrava, Stefania, Fletcher, George, Green, Alastair, Hidders, Jan, Li, Bei, Libkin, Leonid, Marsault, Victor, Martens, Wim, Murlak, Filip, Plantikow, Stefan, Savković, Ognjen, Schmidt, Michael, Sequeda, Juan, Staworko, Sławek, Tomaszuk, Dominik, Voigt, Hannes, Vrgoč, Domagoj, Wu, Mingxi, Živković, Dušan
Publikováno v:
Proc. ACM Manag. Data (2023)
Property graphs have reached a high level of maturity, witnessed by multiple robust graph database systems as well as the ongoing ISO standardization effort aiming at creating a new standard Graph Query Language (GQL). Yet, despite documented demand,
Externí odkaz:
http://arxiv.org/abs/2211.10962
Autor:
Francis, Nadime, Gheerbrant, Amélie, Guagliardo, Paolo, Libkin, Leonid, Marsault, Victor, Martens, Wim, Murlak, Filip, Peterfreund, Liat, Rogova, Alexandra, Vrgoč, Domagoj
The development of practical query languages for graph databases runs well ahead of the underlying theory. The ISO committee in charge of database query languages is currently developing a new standard called Graph Query Language (GQL) as well as an
Externí odkaz:
http://arxiv.org/abs/2210.16580
Queries with aggregation and arithmetic operations, as well as incomplete data, are common in real-world database, but we lack a good understanding of how they should interact. On the one hand, systems based on SQL provide ad-hoc rules for numerical
Externí odkaz:
http://arxiv.org/abs/2210.15395
Autor:
Deutsch, Alin, Francis, Nadime, Green, Alastair, Hare, Keith, Li, Bei, Libkin, Leonid, Lindaaker, Tobias, Marsault, Victor, Martens, Wim, Michels, Jan, Murlak, Filip, Plantikow, Stefan, Selmer, Petra, Voigt, Hannes, van Rest, Oskar, Vrgoč, Domagoj, Wu, Mingxi, Zemke, Fred
As graph databases become widespread, JTC1 -- the committee in joint charge of information technology standards for the International Organization for Standardization (ISO), and International Electrotechnical Commission (IEC) -- has approved a projec
Externí odkaz:
http://arxiv.org/abs/2112.06217
Autor:
Libkin, Leonid, Peterfreund, Liat
The design of SQL is based on a three-valued logic (3VL), rather than the familiar Boolean logic. 3VL adds a truth value unknown to true and false to handle nulls. Viewed as indispensable for SQL expressiveness, it is at the same time much criticized
Externí odkaz:
http://arxiv.org/abs/2012.13198
Autor:
Koehler, Martin, Bogatu, Alex, Civili, Cristina, Konstantinou, Nikolaos, Abel, Edward, Fernandes, Alvaro A. A., Keane, John, Libkin, Leonid, Paton, Norman W.
Publikováno v:
2017 IEEE International Conference on Big Data (Big Data), pp. 956-963, Boston, MA, 11-14 December, 2017
The process of preparing potentially large and complex data sets for further analysis or manual examination is often called data wrangling. In classical warehousing environments, the steps in such a process have been carried out using Extract-Transfo
Externí odkaz:
http://arxiv.org/abs/1811.09248
Autor:
Francis, Nadime, Green, Alastair, Guagliardo, Paolo, Libkin, Leonid, Lindaaker, Tobias, Marsault, Victor, Plantikow, Stefan, Rydberg, Mats, Schuster, Martin, Selmer, Petra, Taylor, Andrés
Cypher is a query language for property graphs. It was originally designed and implemented as part of the Neo4j graph database, and it is currently used in a growing number of commercial systems, industrial applications and research projects. In this
Externí odkaz:
http://arxiv.org/abs/1802.09984