RELATIONSHIP RELATIONS AND NATURAL QUANTIFICATION IN RELATIONAL DATABASES
Date
1987-06-01
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Abstract
An alternative to the conventional method of constructing retrieval
expressions for relational databases is proposed. This alternative
uses precise definitions of relationships between relations, in the
form of relationship relations, as well as quantification of subsets
of a relation that are related to any tuple in the database. The
relationship relation is used to precisely define how a subset
of a relation is related to a tuple. This approach permits not only
the existential and universal quantifiers, but also the large
number of natural quantifiers that exist. Resulting set theoretic
expressions, and expressions in relational languages based on
this technique, usually mirror the corresponding natural language
statement.
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Computer Science