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Data Data Model Data Type Date Look And Feel Marketing
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Alexander Barker
180 terms
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Sonia Kelly
87 terms
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Tommy Mason
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Rosa Sloan
104 terms
Data Data Model Databases Enterprise Information System Network Operating System Structured Query Language
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Aiden Boyd
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Business Data Model Database Systems
oracle sections 4,5 – Flashcards 28 terms
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Robert May
28 terms
Entity-relationship diagrams are documents that show the primary and secondary keys associated with a conceptual data model.
Answer: False
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The process of creating simple data structures from more complex ones, which yields a data model that is very stable and useful across many different requirements, is called:
normalization
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At what phase in SDLC do you create a data model?
The Analysis Phase
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What three languages emerged to standardize the basic network data model, and why was such standardization important to users and designers?
The three languages were: 1. The DDL (schema) constitutes the Data Definition Language for the database schema. The DDL’s use enabled the database administrator to define the database schema, i.e., its over all blueprint. 2. The DDL (subschema) allows the definition of the specific database components that will be used by each application. 3. The DML is the Data Manipulation Language that allows us to manipulate the database contents. Standardization is important to users and designers because it allows them to shift from one commercial application to another with little trouble when they operate at the logical level.
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6) The process of creating simple data structures from more complex ones, which yields a data model that is very stable and useful across many different requirements, is called: A) standardization. B) consistency. C) normalization. D) basic.
C) normalization.
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A data model is the diagrammatic representation of a database that clearly defines a database’s ___ , ____ and ____.
Entities, attributes, relationships.
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All of the following are true about use a pre-existing (packaged) data model, except:
it cannot be customized to fit the terms and business rules of a specific organization.
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Data modeling may be the most important part of the systems development process because:
data characteristics are important in the design of programs and other systems components.
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What is a business rule, and what is its purpose in data modeling?
A business rule is a brief, precise, and unambigous description of a policy, procedure, or principle within a specific organization’s environment. In a sense, business rules are misnamed: they apply to any organization — a business, a government unit, a religious group, or a research laboratory; large or small — that stores and uses data to generate information. Business rules are derived from a description of operations. As its name implies, a description of operations is a detailed narrative that describes the operational environment of an organization. Such a description requires great precision and detail. If the description of operations is incorrect or inomplete, the business rules derived from it will not reflect the real world data environment accurately, thus leading to poorly defined data models, which lead to poor database designs. In turn, poor database designs lead to poor applications, thus setting the stage for poor decision making – which may ultimately lead to the demise of the organization. Note especially that business rules help to create and enforce actions within that organization’s environment. Business rules must be rendered in writing and updated to reflect any change in the organization’s operational environment. Properly written business rules are used to define entities, attributes, relationships, and constraints. Because these components form the basis for a database design, the careful derivation and definition of business rules is crucial to good database design.
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What is the difference between an object and a class in the object oriented data model (OODM)?
An object is an instance of a specific class. It is useful to point out that the object is a run-time concept, while the class is a more static description. Objects that share similar characteristics are grouped in classes. A class is a collection of similar objects with shared structure (attributes) and behavior (methods.) Therefore, a class resembles an entity set. However, a class also includes a set of procedures known as methods.
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