Advanced Topics in Database Research, Vol. 3 by Keng Siau PDF

February 2, 2018 | Data Mining | By admin | 0 Comments

By Keng Siau

ISBN-10: 1591402557

ISBN-13: 9781591402558

ISBN-10: 1591402565

ISBN-13: 9781591402565

This paintings provides examine rules and subject matters on how you can improve database platforms, enhance info garage, refine present database types, and enhance complicated functions. It additionally offers insights into very important advancements within the box of database and database administration.

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A “#” before an attribute indicates that is the primary identifier for the entity type, or at least part of the primary identifier. All associations are binary, and are denoted by named lines. Forward and inverse predicate readings may be supplied at the line end from which they are to be read. Each line-half depicts one of the two roles in the association. Like ORM, Barker ER separates the concepts of optionality and cardinality. If the line-half is solid, this usually means the role is mandatory.

Subtyping schemes for IE vary. Sometimes Euler diagrams are used, adding a blank compartment for “Other”. , MaleEmployee and FemaleEmployee in Figure 1). There is no formal support for subtype definitions. Multiple inheritance may or may not be supported, depending on the version. All our metaschemas use the notation of ORM, a conceptual modeling method that views the world as a set of objects (entities or values) that play roles (parts in relationships, which may be unary, binary or longer). For example, you are now playing the role of being awake (a unary relationship involving just you), and also the role of reading this chapter (a binary relationship between you and this chapter).

Is prohibited. Comparing Metamodels for ER, ORM and UML Data Models 31 Barker ER also supports a restricted form of disjunctive reference, since the roles of a mandatory exclusive arc can be used in an identification scheme. In Figure 3, for example, a line item is identified by combining its invoice with either a product code or a service code. Subtyping is depicted by Euler diagrams. Only single-inheritance is allowed (each subtype has only one supertype). Moreover, the union of the subtypes must equal the supertype, even if this requires an artificial subtype such as “Other” to ensure this.

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Advanced Topics in Database Research, Vol. 3 by Keng Siau

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