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- W1590469553 abstract "Functional dependencies play an important role inrelational database design. They are defined in the contextof a single relation which at all times must containtuples with non-null entries. In this paper we examinean extension of the functional dependency interpretationto handle null values, that is, entries in tuples thatrepresent incomplete information in a relational database.A complete axiomatization of inference rules forextended functional dependencies is also presented.Only after having such results is it possible to talk aboutdecompositions and normalization theory in a context ofincomplete information. Finally, we show that there areseveral practical advantages in using nulls and a weakernotion of constraint satisfiability." @default.
- W1590469553 created "2016-06-24" @default.
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- W1590469553 date "1980-10-01" @default.
- W1590469553 modified "2023-09-23" @default.
- W1590469553 title "Functional Dependencies and Incomplete Information" @default.
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