By Elzbieta Malinowski
This remarkable paintings offers readers with an creation to the state of the art study on info warehouse layout, with many references to extra specific resources. It deals a transparent and a concise presentation of the foremost innovations and ends up in the topic zone. Malinowski and Zimányi clarify traditional information warehouse layout intimately, and also tackle leading edge domain names lately brought to increase the functions of information warehouse platforms: particularly, the administration of spatial and temporal information.
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Additional resources for Advanced data warehouse design : from conventional to spatial and temporal applications
Such research has been introduced into the database standard SQL:2003 [192, 193] under the name of the object-relational model. In addition, current database management systems such as Oracle, Informix, DB2, and PostgreSQL have also introduced object-relational extensions, although these do not necessarily comply with the SQL:2003 standard. 3 Logical Database Design 33 model . , it inherently groups related facts into a single row . This can be done by introducing abstract data types [256, 268].
This table also deﬁnes not null constraints for the mandatory attributes. The identiﬁer of the entity type deﬁnes the primary key of the associated table. Rule 2: A weak entity type is transformed as a strong entity type, with the exception that the associated table includes in addition the identiﬁer of the owner entity type. A referential integrity constraint relates this identiﬁer to the table associated with the owner entity type. The primary key of the table associated with the weak entity type is composed of the partial identiﬁer of the weak entity type and the identiﬁer of the owner entity type.
In our example, we assume that a course has at most one associated section in a semester and a year. In Fig. 1, the partial key attributes are underlined with a dashed line. Finally, owing to the complexity of conceptualizing the real world, human beings usually refer to the same concept using several diﬀerent perspectives with diﬀerent abstraction levels. The generalization (or is-a) relationship captures such a mental process. It relates two entity types, called the supertype and the subtype, meaning that both types represent the same concept at diﬀerent levels of detail.
Advanced data warehouse design : from conventional to spatial and temporal applications by Elzbieta Malinowski