AN ABSTRACT RELATIONAL MODEL AND NATURAL JOIN FUNCTORS - Collections

＜journal article＞
AN ABSTRACT RELATIONAL MODEL AND NATURAL JOIN FUNCTORS

Creator	Creator Name Kato, Akihiko Affiliation Affiliation Name International Institute for Advanced Study of Social Information Science, Fujitsu Limited
Language	English
Publisher	Research Association of Statistical Sciences
Publisher	統計科学研究会
Date	1983-03
Source Title	Bulletin of informatics and cybernetics
Vol	20
Issue	3/4
First Page	95
Last Page	106
Publication Type	Version of Record
Access Rights	open access
Crossref DOI	https://doi.org/10.5109/13349
Related DOI	Bulletin of informatics and cybernetics \|\| 20(3/4) \|\| p95-106
Related DOI	http://bic.math.kyushu-u.ac.jp/
Related URI	Bulletin of informatics and cybernetics \|\| 20(3/4) \|\| p95-106
Related URI	http://bic.math.kyushu-u.ac.jp/
Relation	Bulletin of informatics and cybernetics \|\| 20(3/4) \|\| p95-106
Relation	http://bic.math.kyushu-u.ac.jp/
Abstract	A meta-model for database models called an abstract relational model which is obtained by a categorical abstraction of a relational model is proposed. This meta-model represents various database model...s, e.g. relational, network, hierarchical models as special cases. It is proved that a natural join is the right adjoint of a decomposition in the relational model. On the other hand, in our abstract relational model a natural join is defined as the right adjoint of a decomposition. A sufficient condition is shown for a database model to have natural joins.show more

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