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DOA
2000
13 years 9 months ago
2000
Database schema integration is significant not only in building multidatabase systems but also in data warehousing. Metadata, which define schemas, are normally involved in the su...
SOFSEM
1998
Springer
13 years 12 months ago
1998
Springer
Abstract. Formal methods based on the mathematical theory of partially ordered sets (i.e., posets) have been used in the database field for the modelling of spatial data since many...
IDEAS
2002
IEEE
14 years 20 days ago
2002
IEEE
Boolean expression simplification is a well-known problem in the history of Computer Science. The problem of determining prime implicates from an arbitrary Boolean expression has...
DBA
2004
13 years 9 months ago
2004
We argue for a new aggregate function we termed the LIST function. It aggregates a set of values of one or more attributes into a single value that is internally a list of these v...
ICDE
1998
IEEE
14 years 9 months ago
1998
IEEE
Semistructured data may be irregular and incomplete and does not necessarily conform to a fixed schema. As with structured data, it is often desirable to maintain a history of cha...