Abstract
A mode of association is a set of propositions about a given
association between relations. It is schema-defined and permits
the capture of the precise meaning of an association. Modes of
association may be used with the relational language SQL/N, an
upward compatible extension to SQL. They permit concise SQL/N
expressions even when quite complex associations are involved,
and allow the use of the entire range of natural quantifiers with
all types of association. Because modes of association permit the
user to operate at a higher level of abstraction than with SQL,
subtle errors of intent are more likely. An intent analyser can be
used to detect such errors in SQL/N expressions. Some intent
analyser procedures are described.
Notes
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