000 | 03066nam a22005055i 4500 | ||
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001 | 978-3-540-47110-3 | ||
003 | DE-He213 | ||
005 | 20160624102020.0 | ||
007 | cr nn 008mamaa | ||
008 | 121227s1992 gw | s |||| 0|eng d | ||
020 |
_a9783540471103 _9978-3-540-47110-3 |
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024 | 7 |
_a10.1007/3-540-55493-9 _2doi |
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050 | 4 | _aQA76.9.D3 | |
072 | 7 |
_aUN _2bicssc |
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_aUMT _2bicssc |
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072 | 7 |
_aCOM021000 _2bisacsh |
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082 | 0 | 4 |
_a005.74 _223 |
245 | 1 | 4 |
_aThe Nested Universal Relation Database Model _h[electronic resource] / _cedited by M. Levene. |
260 | 1 |
_aBerlin, Heidelberg : _bSpringer Berlin Heidelberg, _c1992. |
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264 | 1 |
_aBerlin, Heidelberg : _bSpringer Berlin Heidelberg, _c1992. |
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300 |
_aX, 182 p. _bonline resource. |
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_atext _btxt _2rdacontent |
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_acomputer _bc _2rdamedia |
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_aonline resource _bcr _2rdacarrier |
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_atext file _bPDF _2rda |
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_aLecture Notes in Computer Science, _x0302-9743 ; _v595 |
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505 | 0 | _aThe underlying database models -- The null extended nested relational model -- Null extended data dependencies and the extended chase -- A universal relation model for a nested database -- A universal relation model for a single nested relation -- Concluding remarks and ongoing research. | |
520 | _aThis monograph describes a method of data modelling whose basic aim is to make databases easier to use by providing them with logical data independence. To achieve this, the nested UR (universal relation) model is defined by extending the classical UR model to nested relations. Nested relations generalize flat relations and allow hierarchically structured objects to be modelled directly, whereas the classical UR model allows the user to view the database as if it were composed of a single flat relation. The author presents a comprehensive formalisation of the nested relational model, which incorporated null values into the model. Functional data dependencies and the classical notion of lossless decomposition are extended to nested relations and an extended chase procedure is defined to test the satisfaction of the data dependencies. The nested UR model is defined, and the classical UR model is shown to be a special case of the nested model.This implies that an UR interface canbe implemented by using the nested UR model, thus gaining the full advantages of nested relations over flat relations. | ||
650 | 0 | _aComputer science. | |
650 | 0 | _aSoftware engineering. | |
650 | 0 | _aDatabase management. | |
650 | 1 | 4 | _aComputer Science. |
650 | 2 | 4 | _aDatabase Management. |
650 | 2 | 4 | _aComputation by Abstract Devices. |
650 | 2 | 4 | _aSoftware Engineering. |
700 | 1 |
_aLevene, M. _eeditor. |
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710 | 2 | _aSpringerLink (Online service) | |
773 | 0 | _tSpringer eBooks | |
776 | 0 | 8 |
_iPrinted edition: _z9783540554936 |
786 | _dSpringer | ||
830 | 0 |
_aLecture Notes in Computer Science, _x0302-9743 ; _v595 |
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856 | 4 | 0 | _uhttp://dx.doi.org/10.1007/3-540-55493-9 |
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_2EBK5981 _cEBK |
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_c35275 _d35275 |