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関数従属性
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Wikipedia definition
1. Functional dependency​A functional dependency (FD) is a constraint between two sets of attributes in a relation from a database. Given a relation R, a set of attributes X in R is said to functionally determine another attribute Y, also in R, (written X → Y) if, and only if, each X value is associated with precisely one Y value. Customarily we call X the determinant set and Y the dependent attribute.
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