By Katsumi Tanaka, Shahram Ghandeharizadeh, Yahiko Kambayashi
Information association and Databases: Foundations of DataOrganization offers contemporary advancements of knowledge association applied sciences that experience develop into the most important not just for facts mining purposes and data visualization, but additionally for remedy of semistructured information, spatio-temporal facts and multimedia information that aren't inevitably kept in traditional DBMSs.
details association and Databases: Foundations of information association offers:
- semistructured facts addressing XML, question languages and integrity constraints, concentrating on complex applied sciences for organizing net information for powerful retrieval;
- multimedia database association emphasizing video facts association and knowledge constructions for similarity retrieval;
- applied sciences for facts mining and knowledge warehousing;
- index association and effective question processing concerns;
- spatial facts entry and indexing;
- organizing and retrieval of WWW and hypermedia.
Information association and Databases: Foundations of DataOrganization is a source for database practitioners, database researchers, designers and directors of multimedia details structures, and graduate-level scholars within the zone of knowledge retrieval and/or databases wishing to maintain abreast of advances within the info association technologies.
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Extra info for Information Organization and Databases: Foundations of Data Organization
We would like to extend this last rule to queries without ordered-by, and say that in that case one just preserves the order in the input. But we need to be more precise here. year vVhat does it mean for this query to "preserve the order in the input" ? Finally, we only mention that, in the context of query languages with declarative updates, one also needs to worry about being able to insert new objects at specific places in lists. Translation between data models. Most data used in current day to day business transactions is stored in relational databases.
Therefore, the notion of reference path in complex objects is a very essential concept in OODBs. However, the integrity constraints for the reference path in complex objects are not discussed enough in formal. In this paper, we propose a notion of path existence constraint definitions (in short, PED) as a method to treat formally the existence dependencies, especially, among object reference paths. By introducing the notion of selector variables, an arbitrary object can be specified as a unit of the path existence constraints.
Some researchers have addressed query optimization from a theoretical angle. Abiteboul and Vianu [Abiteboul and Vianu, 1997] consider path equations: given some path constraints on a data instance, certain path expressions can be replaced with simpler ones. , 1998]: they show that containment and equivalence conjunctive queries with regular path expressions decidable, and, moreover, for a restricted case, the complexity is NP. Both results are still at a theoretical level and have not yet been applied in a practical framework.