Database Systems (TODS)


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ACM Transactions on Database Systems (TODS), Volume 26 Issue 2, June 2001

Querying ATSQL databases with temporal logic
Jan Chomicki, David Toman, Michael H. Böhlen
Pages: 145-178
DOI: 10.1145/383891.383892
We establish a correspondence between temporal logic and a subset of ATSQL, a temporal extension of SQL-92. In addition, we provide an effective translation from temporal logic to ATSQL that enables a user to write high-level queries which are...

Data Mining with optimized two-dimensional association rules
Takeshi Fukuda, Yasuhiko Morimoto, Shinichi Morishita, Takeshi Tokuyama
Pages: 179-213
DOI: 10.1145/383891.383893
We discuss data mining based on association rules for two numeric attributes and one Boolean attribute. For example, in a database of bank customers, Age and Balance are two numeric attributes, and CardLoan is a Boolean attribute. Taking the...

Flexible support for multiple access control policies
Sushil Jajodia, Pierangela Samarati, Maria Luisa Sapino, V. S. Subrahmanian
Pages: 214-260
DOI: 10.1145/383891.383894
Although several access control policies can be devised for controlling access to information, all existing authorization models, and the corresponding enforcement mechanisms, are based on a specific policy (usually the closed policy). As a...