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In database design, a lossless join decomposition is a decomposition of a relation into relations , such that a natural join of the two smaller relations yields back the original relation. This is central in removing redundancy safely from databases while preserving the original data. [ 1 ]
The chase is a simple fixed-point algorithm testing and enforcing implication of data dependencies in database systems.It plays important roles in database theory as well as in practice.
The join dependency plays an important role in the fifth normal form (5NF), also known as project-join normal form, because it can be proven that if a scheme is decomposed in tables to , the decomposition will be a lossless-join decomposition if the legal relations on are restricted to a join dependency on called (,, …,).
Intuitively, if a functional dependency X → Y holds in R, then the relation can be safely split in two relations alongside the column X (which is a key for () ()) ensuring that when the two parts are joined back no data is lost, i.e. a functional dependency provides a simple way to construct a lossless join decomposition of R in two smaller ...
As Los Angeles Lakers fans process the stunning trade for Luka Dončić, they can rest easy on one thing: LeBron James reportedly isn't going anywhere.James plans to stay with Los Angeles beyond ...
Quarterback Matthew Sluka, who created a national conversation about the ramifications of name, image and likeness after departing UNLV, has transferred to James Madison.. His new school posted a ...
Distributed coding is the coding of two, in this case, or more dependent sources with separate encoders and a joint decoder.Given two statistically dependent independent and identically distributed finite-alphabet random sequences and , the Slepian–Wolf theorem gives a theoretical bound for the lossless coding rate for distributed coding of the two sources.
CORTINA D'AMPEZZO, Italy (AP) — Lindsey Vonn took it easier in downhill training on Friday a day after crashing for the first time of her World Cup comeback at age 40. Vonn finished more than ...