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March 19, 2010

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What are the unary operations in Relational Algebra?

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Asked By: mariann |

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PROJECTION and SELECTION.

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Tuesday, May 13, 2008

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RDBMS, Database, Data Warehousing

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Database Engineer

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217

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What do you understand by dependency preservation?

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Asked By: parktren |

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Given a relation R and a set of FDs F, dependency preservation states that the closure of the union of the projection of F on each decomposed relation Ri is equal to the closure of F. i.e.,

((PR1(F)) U . U (PRn(F)))+ = F+

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Tuesday, May 13, 2008

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RDBMS, Database, Data Warehousing

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Database Engineer

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312

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What is Apse?

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Asked By: love03 |

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It is a semi-circular or polygonal projection of a building, with a half dome or conch (bowl-shaped vault). In churches it is at the end of the central nave (sometimes also at the end of the side naves or transept) and houses the main altar and the choir. Two identical, facing apses are known as a double apse and where, as in some Romanesque churches, there are three, a triple apse.

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Sunday, April 27, 2008

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architecture

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Architect

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248

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What is Macro photography?

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Asked By: Anonymous |

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Macro photography refers to close-up photography; the classical definition that the image projected on the film plane when held close to the same size as the subject.

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Sunday, August 26, 2007

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photography, close up, image, Macro photography, film plane, projection

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