By J. Paredaens, L. Tenenbaum
Advanced info know-how is pervasive in any type of human job - technological know-how, company, finance, administration and others - and this can be quite real for database platforms. either database concept and database functions represent a crucial a part of the cutting-edge of machine technological know-how. in the meantime there's a few discrepancy among varied features of database job. Theoreticians are often no longer a lot conscious of the true wishes of commercial and undefined; software program experts no longer constantly have the time or the apportunity to get conversant in the newest theoretical principles and developments, in addition to with complex prototypes bobbing up from those rules; strength clients frequently would not have the potential for comparing the theoretical foundations and the aptitude useful impression of other advertisement items. So the most objective of the direction used to be to place jointly humans concerned about diversified elements of database job and to advertise energetic alternate of principles between them.
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Under this hypothesis, in the situation used for the above example all couples (region, river-segment) which satisfy the spatial interseetion relation could be explicitly stored in the database, and a query asking for "all rivers passing through 'X' region" would not need any spatial predicate to be computed. 2. Methodology issues in modeling. The remarks previously made about the user profiles make evident the fact that the activity of the new kind of user of GIS is characterised by an higher level of abstraction from the implementation details than it was in the past.
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Advances in Database Systems: Implementations and Applications by J. Paredaens, L. Tenenbaum