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Geographical features, such as states and large lakes, are represented as complex polygons Some features, such as rivers, may be represented either as complex curves or as complex polygons, depending on whether their width is relevant Geographic information related to regions, such as annual rainfall, can be represented as an array that is, in raster form For space ef ciency, the array can be stored in a compressed form In Section 2335, we study an alternative representation of such arrays by a data structure called a quadtree As noted in Section 2333, we can represent region information in vector form, using polygons, where each polygon is a region within which the array value is the same The vector representation is more compact than the raster representation in some applications It is also more accurate for some tasks, such as depicting roads, where dividing the region into pixels (which may be fairly large) leads to a loss of precision in location information However, the vector representation is unsuitable for applications where the data are intrinsically raster based, such as satellite images

Nullify: Set the foreign key of related rows to null For example, if a Faculty row is deleted, then set FacSSN to NULL in related Offering rows Likewise, if Faculty FacSSNis updated, then set FacSSN to NULL in related Offering rows The nullify action is not permitted if the foreign key does not allow null values For example, the nullify option is not valid when deleting rows of the Student table because Enrollment StdSSN is part of the primary key Default: Set the foreign key of related rows to its default value For example, if a Fac ulty row is deleted, then set FacSSN to a default faculty in related Offering rows The default faculty might have an interpretation such as "to be announced" Likewise, if FacultyFacSSN is updated, then set FacSSN to its default value in related Offering rows The default action is an alternative to the nullify action as the default action avoids null values The delete and update actions can be specified in SQL using the ON DELETE and ON UPDATE clauses These clauses are part of foreign key constraints For example, the revised CREATE TABLE statement for the Enrollment table shows ON DELETE and ON UPDATE clauses for the Enrollment table The RESTRICT keyword means restrict (the first possible action) The keywords CASCADE, SET NULL, and SET DEFAULT can be used to specify the second through fourth options, respectively CREATE TABLE Enrollment (

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Geographic databases have a variety of uses, including online map services, vehiclenavigation systems; distribution-network information for public-service utilities such

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The McGraw Hill Companies, 2001

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OfferNo INTEGER, StdSSN CHAR(11), EnrGrade DECIMAL(3,2), CONSTRAINT PKEnrollment PRIMARY KEY (OfferNo, StdSSN), CONSTRAINT FKOfferNo FOREIGN KEY (OfferNo) REFERENCES Offering ON DELETE RESTRICT ON UPDATE CASCADE, CONSTRAINT FKStdSSN FOREIGN KEY (StdSSN) REFERENCES Student ON DELETE RESTRICT ON UPDATE CASCADE )

as telephone, electric-power, and water-supply systems; and land-usage information for ecologists and planners Web-based road map services form a very widely used application of map data At the simplest level, these systems can be used to generate online road maps of a desired region An important bene t of online maps is that it is easy to scale the maps to the desired size that is, to zoom in and out to locate relevant features Road map services also store information about roads and services, such as the layout of roads, speed limits on roads, road conditions, connections between roads, and oneway restrictions With this additional information about roads, the maps can be used for getting directions to go from one place to another and for automatic trip planning Users can query online information about services to locate, for example, hotels, gas stations, or restaurants with desired offerings and price ranges Vehicle-navigation systems are systems mounted in automobiles, which provide road maps and trip planning services A useful addition to a mobile geographic information system such as a vehicle navigation system is a Global Positioning System (GPS) unit, which uses information broadcast from GPS satellites to nd the current location with an accuracy of tens of meters With such a system, a driver can never3 get lost the GPS unit nds the location in terms of latitude, longitude, and elevation and the navigation system can query the geographic database to nd where and on which road the vehicle is currently located Geographic databases for public-utility information are becoming increasingly important as the network of buried cables and pipes grows Without detailed maps, work carried out by one utility may damage the cables of another utility, resulting in large-scale disruption of service Geographic databases, coupled with accurate location- nding systems, can help avoid such problems So far, we have explained why spatial databases are useful In the rest of the section, we shall study technical details, such as representation and indexing of spatial information.

Between two TACACS+ Servers (no new info) Between two TACACS+ Servers (update 10 users)

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