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The Computer Journal 1986 29(4):378-379; doi:10.1093/comjnl/29.4.378
© 1986 by British Computer Society
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Short Notes

Join Dependencies in Relational Databases and the Geometry of Spatial Grids

J. Bradley

University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4

It is shown that a relation whose tuples describe a regular folded spatial grid contains a join dependency, that originates in the geometrical properties of the grid. There is a class of join dependencies corresponding to 2-dimensional grids, or polygonal join dependencies, and a class corresponding to 3-dimensional grids, or polyhedral join dependencies, and so on.

Received August 1985.


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