Optician
发表于 2025-3-21 16:04:15
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Anguish
发表于 2025-3-21 23:57:25
Some Fundamentals of Dependency Theory, in their comprehension, and then their solution. Logic is just a formal system; many other formal systems have been proposed and applied to databases. In the axiomatic approach, a formal system relies upon an object language, semantics or interpretation of formulas in that language and a proof theory.
拾落穗
发表于 2025-3-22 02:12:56
Dependencies in Relations with Null Values and Incomplete Informations,hat they are not drawn from the value set for that entry. Some of such special values are of the meaning “value unknown”, “item inapplicable”, “value exists but cannot be stored”, “value is not complete classified” etc. (14 different types of null values are well known /ANSI 75/).
草率女
发表于 2025-3-22 05:19:35
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ingenue
发表于 2025-3-22 09:13:49
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项目
发表于 2025-3-22 12:55:55
Erchimen Gavriliev,Tatiana Avdeenkohat they are not drawn from the value set for that entry. Some of such special values are of the meaning “value unknown”, “item inapplicable”, “value exists but cannot be stored”, “value is not complete classified” etc. (14 different types of null values are well known /ANSI 75/).
项目
发表于 2025-3-22 18:09:54
Erchimen Gavriliev,Tatiana Avdeenkoerator, was formalized, using Codd-functional and multivalued dependencies. Such horizontal decompositions /DBPA 83/ are useful in the normalization of schemata in which hidden constraints are involved.
BILE
发表于 2025-3-23 00:48:09
Horizontal Decomposition Dependencies,erator, was formalized, using Codd-functional and multivalued dependencies. Such horizontal decompositions /DBPA 83/ are useful in the normalization of schemata in which hidden constraints are involved.
Nebulizer
发表于 2025-3-23 01:28:35
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MOTIF
发表于 2025-3-23 08:55:29
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