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QuoteRef: chenPP_1977b
topics >
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ThesaHelp:
references c-d
Topic:
representing a relationship
Topic:
attribute-value pairs as information
Topic:
entity-relationship database model
Topic:
using a description as a name
Topic:
deletion of information
Group:
derived data types
Reference
Chen, P.P., "The entity-relationship approach to logical data base design", Q.E.D. monograph on Data base management No. 6, Wellesley, Massachusetts, Q.E.D. Information Sciences, Inc., 1977. Google
20 ;;Quote: a 3-way relationship is not equivalent to three binary relationships; otherwise generate superfluous non-facts
20 ;;Quote: use attribute-value pairs to express properties of entities and relationships; e.g., "age of x is 24"
20 ;;Quote: in an entity-relationship diagram use circles for values and arrows for attributes
23 ;;Quote: if attributes uniquely identify an entity than can use attribute-value pairs as identifiers
24 ;;Quote: the existence of a weak entity type depends on the existence of other entities; e.g., the set of children for an employee
24 ;;Quote: if an entity is not identified by its attributes, need to include its relationships to other entities; e.g.,. an address needs street, city, state
39 ;;Quote: identify entities and relationships, draw E-R diagram, identify values and attributes, translate into data-structure and records
ThesaHelp: references c-d (337 items)
Topic: representing a relationship (28 items)
Topic: attribute-value pairs as information (53 items)
Topic: entity-relationship database model (21 items)
Topic: using a description as a name (21 items)
Topic: deletion of information (11 items)
Group: derived data types (9 topics, 119 quotes)