By Franca Garzotto (auth.), Albertas Caplinskas, Johann Eder (eds.)
This booklet constitutes the refereed court cases of the fifth East ecu convention on Advances in Databases and knowledge structures, ADBIS 2001, held in Vilnius, Lithuania, in September 2001.
The 25 revised complete papers provided including one invited paper and abstracts of invited talks have been rigorously reviewed and chosen from eighty two submissions. The papers are geared up in topical sections on question optimization, multimedia and multilingual info structures, spatiotemporal facets of databases, facts mining, transaction processing, conceptual modeling and knowledge platforms specification, lively databases, question tools, XML, and data structures design.
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Extra info for Advances in Databases and Information Systems: 5th East European Conference, ADBIS 2001 Vilnius, Lithuania, September 25–28, 2001 Proceedings
The reason is that a dot and quantifiers have a special property: it is possible for them to consume only a part of the result of their left subquery, which makes the rest of that left operand not contribute to the result of the entire query. Other non-algebraic operators considered in SBA, like a selection or a dependent join, do not have this property. For example, consumes the whole result of its left subquery thus does not cause any subquery to be dead. The where operator can use only a part of the result of its left operand, but the whole of that left subquery determines the result of a query.
The view below gets for each professor his/her name, salary, and calculates a bonus he/she should receive, giving them auxiliary names n, s, and b, respectively. The view can be considered the definition of virtual objects named ProfNameSalaryBonus having attributes n, s, and b. view ProfNameSalaryBonus begin return Professor. n After macro-substitution it has the form: (Professor. e. 5*salary + 10*age)*count(gives)) as b. Hence the latter two subqueries are dead and can be removed. name by another optimization method (removing unnecessary auxiliary names ).
It is interesting to see how in our design of SOWing entities traditional elements of object-oriented classes coexist with novel aspects of subject-oriented modelling. This coexistence of object- and subject-oriented semantic elements is illustrated by the diagram in Fig. 10 which is based on an extended UML notation. The upper right third of the diagram shows a traditional class hierarchy of an object-oriented model. On top is the class “Object” representing the root of the class hierarchy. From this a class “Case Entry” is derived which has attributes for the features which all kinds of case entries share.