A probabilistic relational database model and algebra
نویسندگان
چکیده
منابع مشابه
A Fuzzy Probabilistic Relational Database Model and Algebra
This paper describes an extended relational database model based on probability theory and possibility theory. Fuzzy information and probabilistic information are incorporated into the relational databases simultaneously to represent fuzzy probability of events in the real-world applications. The tuples in such a relation are associated with a possibility distribution, and their attribute value...
متن کاملA Probabilistic NF2 Relational Algebra for Integrated Information Retrieval and Database Systems
The integration of information retrieval (IR) and database systems requires a data model which allows for modelling documents as entities, representing uncertainty and vagueness and performing uncertain inference. For this purpose, we present a probabilistic data model based on relations in non-rst-normal-form (NF2). Here, tuples are assigned probabilistic weights giving the probability that a ...
متن کاملThe relational data model and relational algebra
The early days of database engines (1960’s) saw several competing “data models” (the formal specifications for how the system represents and reasons about data). Academic researchers had proposed several models that were rich, expressive, and provided admirable data independence, but that were impossible to implement efficiently. The models used by working systems, on the other hand, tended to ...
متن کاملRelational Algebra for In-Database Process Mining
The execution logs that are used for process mining in practice are often obtained by querying an operational database and storing the result in a flat file. Consequently, the data processing power of the database system cannot be used anymore for this information, leading to constrained flexibility in the definition of mining patterns and limited execution performance in mining large logs. Ena...
متن کاملA Probabilistic NF2 Relational Algebra for Imprecision in Databases
We present a probabilistic data model which is based on relations in non-rst-normal-form (NF2). Here, tuples are assigned probabilistic weights giving the probability that a tuple belongs to a relation. This way, imprecise attribute values are modelled as a probabilistic subrelation. For information retrieval, the set of weighted index terms of a document can be represented in the same way, thu...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Computer Science and Cybernetics
سال: 2015
ISSN: 1813-9663,1813-9663
DOI: 10.15625/1813-9663/31/4/5742