A constraint involving three columns. The mvd a ¨¨ b | c (read a multidetermines b or c) means that (1) a given a value is associated with a collection of b and c values; and (2) b and c are independent given the relationships between a and b and a and c. All fds are also mvds, but not all mvds are fds. An mvd is nontrivial if it is also not an fd.
Tags: Database, Education, Software
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