By J. Paredaens, L. Tenenbaum
Advanced details know-how is pervasive in any type of human task - technology, company, finance, administration and others - and this can be quite actual for database platforms. either database concept and database purposes represent a vital a part of the state-of-the-art of machine technology. in the meantime there's a few discrepancy among various elements of database job. Theoreticians are often no longer a lot conscious of the true wishes of industrial and undefined; software program experts no longer regularly have the time or the apportunity to get accustomed to the latest theoretical rules and developments, in addition to with complex prototypes bobbing up from those principles; capability clients usually should not have the potential of comparing the theoretical foundations and the aptitude sensible effect of other advertisement items. So the most aim of the path was once to place jointly humans considering various facets of database task and to advertise lively alternate of rules between them.
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On the other hand, the spatial join , together with few fundamental geometrie al operations sueh as interseetion, composition of sub-components and so on, provides a strong platform for a large class of applications. For example, consider the following typical query: "extract all wheat jlelds whose distance is less than 500 m tram the river R". Just in appearanee a distance operator, to be applied to the whole database, is required; on the contrary, a Iinebufler operator (that geometrically builds the locus of the points for which the distanee from a line is less than a fixed value) may be applied to the river R; successively, a spatial join may be applied to the resulting region and to the wheat map to obtain the result of the query.
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Advances in Database Systems: Implementations and Applications by J. Paredaens, L. Tenenbaum