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|Title:||APPLICATION OF SQL/N AND ASSOCIATION MODES TO DATA BASES CONTAINING RECURSIVE ASSOCIATIONS|
|Abstract:||Modes of association are defined for the recursive associations that occur in bill of materials data bases and data bases for the family trees of corporations. It is shown that a series of useful modes may be explicitly defined. Modes of association may be schema defined to enable a relational data base system to capture more meaning about an association. When used with natural quantifiers and SQL/N, an upward-compatible extension of SQL, these modes permit construction of concise expressions for complex retrievals involving explosions and implosions of entities described in the data base. Full explosions/implosions may be expressed in SQL/N, which is not possible with SQL. A mode of association is a set of propositions, but may be defined and implemented as a relationship relation.|
|Appears in Collections:||Bradley, James|
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