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What is RELATIONSHIPS

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A relationship is some association between entities. In this section we shall concentrate on binary relationships. That is, associations between…

What is ENTITIES

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An entity may be defined as a thing which an organization recognizes as being capable of an independent existence and…

Representing Relational Databases

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A relational database consists of one or more tables. The common convention for representing a description of a relational database…

Relational keys

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Super key A column, or set of columns that uniquely identifies a record within a table. Candidate key A superkey…

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