Chapters: Database, Relational Database, Entity-Attribute-Value Model, Temporal Database, Database Model, Conjunctive Query, V-Optimal Histograms, View, Database Design, Triplestore, Functional Dependency, Least Number Bits, Database Storage Structures, Nested Set Model, Transitive Dependency, Probabilistic Database, Principle of Orthogonal Design, Chase, Nonpositive Data, Symposium on Principles of Database Systems, Cascading Rollback, Dependency Theory, Relational Classification. Source: Wikipedia. Pages: 128. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: Entity-Attribute-Value model (EAV), also known as object-attribute-value model and open schema is a data model that is used in circumstances where the number of attributes (properties, parameters) that can be used to describe a thing (an "entity" or "object") is potentially vast, but the number that will actually apply to a given entity is relatively modest. In mathematics, this model is known as a sparse matrix. The most well-known example of EAV modeling in production databases is seen with the clinical findings (past history, present complaints, physical examination, lab tests, special investigations, diagnoses) that can apply to a patient. Across all specialties of medicine, these can range in the hundreds of thousands (with new tests being developed every month). The majority of individuals who visit a doctor, however, have relatively few findings. No doctor would ever have the time to ask a patient about every possible finding. Instead, the doctor focuses on the primary complaints, and asks questions related to these. Still other questions are based on the responses to previously asked questions. Other questions or tests may be related to findings in the physical exam. The presence of certain findings automatically rules out ma...More: http: //booksllc.net/?id=592133
|Title:||Database Theory: Database, Relational Database, Entity- Attribute- Value Model, Temporal Database, Database Model, Conjunctive Query||Publisher:||Books LLC, Wiki Series|
|Author:||Llc Books, Llc Books|
|No. of Pages:||52|
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