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The cross-section of twisted pair
The cross-section of each and every strand of the twisted pair is π/4 square mm. A 10-km length of this type of material, with two strands per pair will have a volume of 2π/4 × 10-2 m3. This volume is around 15,708 cm3. With specific gravity of 9.0, each local loop has mass of 141 kg. The phone company therefore owns1.4 × 109 kg of copper. At 3 dollars each, copper is worth about 4.2 billion dollars.
Let us now talk about the relational operations: SELECT The select operation is used to select few specific record from the database based on different criteria, This is a un
System R was developed and designed over a period of 1974-79 at IBM San Jose Research Company. Its purpose was to illustrate that it is possible to create a Relational System tha
Project Description: I need a point of sale for motels. It needs to run on windows and requires being network able so that we can have more than one computer using it at once.
management information system based on functional organisation
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Design an EER schema for the following application and translate the EER schema into relational schemas (and constraints). It is possible that some requirements cannot be captured
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What is a PROJECT operation? The project operation is a unary operation that returns its argument relation with particular attributes left out. Projection is shown by pie (π).
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