TY - GEN
T1 - An abstract framework for generating maximal answers to queries
AU - Cohen, Sara
AU - Sagiv, Yehoshua
PY - 2005
Y1 - 2005
N2 - A framework for modeling query semantics as graph properties is presented. In this framework, a single definition of a query automatically gives rise to several semantics for evaluating that query under varying degrees of incomplete information. For example, defining natural joins automatically gives rise to full disjunctions. Two of the proposed semantics have incremental-polynomial- time query-evaluation algorithms for all types of queries that can be defined in this framework. Thus, the proposed framework generalizes previous definitions of semantics for incomplete information and improves previous complexity results for query evaluation.
AB - A framework for modeling query semantics as graph properties is presented. In this framework, a single definition of a query automatically gives rise to several semantics for evaluating that query under varying degrees of incomplete information. For example, defining natural joins automatically gives rise to full disjunctions. Two of the proposed semantics have incremental-polynomial- time query-evaluation algorithms for all types of queries that can be defined in this framework. Thus, the proposed framework generalizes previous definitions of semantics for incomplete information and improves previous complexity results for query evaluation.
UR - http://www.scopus.com/inward/record.url?scp=77049088031&partnerID=8YFLogxK
U2 - 10.1007/978-3-540-30570-5_9
DO - 10.1007/978-3-540-30570-5_9
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AN - SCOPUS:77049088031
SN - 3540242880
SN - 9783540242888
T3 - Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
SP - 129
EP - 143
BT - Database Theory - ICDT 2005 - 10th International Conference, Proceedings
T2 - 10th International Conference on Database Theory, ICDT 2005
Y2 - 5 January 2005 through 7 January 2005
ER -