Some problems for join dependency and project-join normal form.
نویسندگان
چکیده
منابع مشابه
Fuzzy Join Dependency in Fuzzy Relational Databases
The join dependency provides the basis for obtaining lossless join decomposition in a classical relational schema. The existence of Join dependency shows that that the tables always represent the correct data after being joined. Since the classical relational databases cannot handle imprecise data, they were extended to fuzzy relational databases so that uncertain, ambiguous, imprecise and part...
متن کاملI/O-efficient join dependency testing, Loomis-Whitney join, and triangle enumeration
Article history: Received 17 August 2015 Received in revised form 21 April 2016 Accepted 17 May 2016 Available online 11 June 2016
متن کاملJoin spaces , soft join spaces and lattices
The aim of this paper is to initiate and investigate new (soft) hyperstructures, particularly (soft) join spaces, using important classes of lattices: modular and distributive. They are used in order to study (soft) hyperstructures constructed on the set of all convex sublattices of a lattice.
متن کاملClone Join and Shadow Join: Two Parallel Algorithms for Executing Spatial Join Operations
With the growing popularity of spatial applications, there has been a signiicant increase in the use of database systems for storing and querying spatial data. Spatial data is now readily available from a variety of sources including government mapping agencies, commercial sources, satellite images, and simulation outputs. As this trend continues, applications continue to execute increasingly c...
متن کاملglobal results on some nonlinear partial differential equations for direct and inverse problems
در این رساله به بررسی رفتار جواب های رده ای از معادلات دیفرانسیل با مشتقات جزیی در دامنه های کراندار می پردازیم . این معادلات به فرم نیم-خطی و غیر خطی برای مسایل مستقیم و معکوس مورد مطالعه قرار می گیرند . به ویژه، تاثیر شرایط مختلف فیزیکی را در مساله، نظیر وجود موانع و منابع، پراکندگی و چسبندگی در معادلات موج و گرما بررسی می کنیم و به دنبال شرایطی می گردیم که متضمن وجود سراسری یا عدم وجود سراسر...
ذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Computer Science and Cybernetics
سال: 2012
ISSN: 1813-9663,1813-9663
DOI: 10.15625/1813-9663/17/1/2435