MAITE LPU - Laguna Definitions Entity an aggregation of a number of data elements each data element is an attribute of the entity Background Introduced by Peter Chen in ‘75 now widely used You’ll find them in: Structured Systems Analysis and Design Methodology (SSADM) Information Engineering (IE) Multiview Yourdon/DeMarco. Entity type a class of entities with the same attributes Relationship an association between two or more entities that is of particular interest Why use ER Diagrams
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meanings rather than an actual implementation The E-R Model: The enterprise is viewed as set of * Entities * Relationships among entities Symbols used in E-R Diagram * Entity – rectangle * Attribute – oval * Relationship – diamond * Link - line Entities and Attributes Entity: an object that is involved in the enterprise and that be distinguished from other objects. (not shown in the ER diagram--is an instance) * Can be person‚ place‚ event‚ object‚ concept in the
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only a few efforts have been done investigating the conversion of relational into multidimensional database schema. This paper proposes the general procedure of such a conversion. The procedure can be partly automated because some decisions of attribute type must be made during conversion. Keywords: relational database‚ relational schema‚ multidimensional database‚ multidimensional schema‚ conversion. 1. Introduction Operational information systems that lean on the relational model may be
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select six attributes from six different princesses. The six attributes would then build a princess and the writer must reinforce and justify why the new princess is strong. The essay would be persuading the reader that the six attributes that are chosen are considered to be strong attributes of a princess. The assignment genre would be about building a princess by
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Faculty of Computer and Information Science‚ Trˇ aˇka 25‚ z s 1001 Ljubljana‚ Slovenia tel.: + 386 1 4768386 fax: + 386 1 4264647 Abstract. Relief algorithms are general and successful attribute estimators. They are able to detect conditional dependencies between attributes and provide a unified view on the attribute estimation in regression and classification. In addition‚ their quality estimates have a natural interpretation. While they have commonly been viewed as feature subset selection methods
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no repeating groups 2. All non-key attributes of a table must rely on the entire key of the table. 3. All non-key fields must depend solely on the table’s primary key. First Business Normal Form: removes repeating groups to another entity. This entity takes its name and primary (compound) key attributes‚ from the original entity and forms the repeating group. (Repeating groups of data are moved to another table). Second Business Normal Form: removes attributes that are partially dependent on the
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Brand mapping is often used in brand research by placing products and attributes together on a map. This allows close interpretation of company perceptions with a variety of product and service attributes simultaneously. (See Figure 1) Graphical interpretation of a Brand map Brands are strongly associated with the attributes which are closest to them on the map. From this a clear understanding can be gained about what attributes are associated with which product. If products are placed close to
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Transform conceptual UML class diagrams to logical ODL schemas by mapping classes (abstract and concrete)‚ attributes‚ operations (abstract and concrete)‚ association relationships (one-to-one‚ one-tomany‚ and many-to-many)‚ and generalization relationships. ● Identify the type specifications for attributes‚ operation arguments‚ and operation returns. ● Create objects and specify attribute values for those objects. ● Understand the steps involved in implementing object-oriented databases. ● Understand
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Running head: ATTRACTIVENESS AND ATTRIBUTES 1 A Big “A” for Attractiveness: How Facial Attractiveness Influence Attribution Formation of the Opposite Gender ATTRACTIVENESS AND ATTRIBUTES 2 Abstract The experiment was designed to test how physical appearances (particularly that of facial attractiveness) influence males’ and females’ attribution formation of their biological counterparts. Male and female college students (N=30)
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Example This is a link _________________________________________________________________________________ HTML Images HTML images are defined with the tag. The source file (src)‚ alternative text (alt)‚ and size (width and height) are provided as attributes: Example
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