Group: relationship information

Summary

A relationship is a set of associations between entities for the same reason. For example the parent relationship is the set of all parent-child associations. A relationship may be represented by a table of tuples, a list of facts, or a graph. Though an entity could be a set of entities, it is normally a single thing. (cbb 1/90)

Subtopic: relationship as association

Quote: a relationship is a set of associations between things for a given reason [»kentW_1978]

Quote: a relationship set is relationships of the same type between entities [»chenPP_1977]

Quote: an important part of a relationship is the reason for an association [»kentW_1978]

Subtopic: between objects or sets

Quote: in conceptual modeling, relations are between objects instead of names of objects [»borgA1_1985]

Quote: a relationship could be between an object and a set of objects, but Kent does not pursue this option [»kentW_1978]

Subtopic: multiple relationships

Quote: to describe data, must represent multiple relationships between objects

Group: relationship information

Topic: kinds of relationships between data (16 items)
Topic: name of a relationship (5 items)
Topic: relationship as an object (6 items)
Topic: representing a relationship (28 items)
Topic: roles of a relationship
(8 items)

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