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SQL GROUP BY and Functional Dependencies: A Very Useful Feature

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justin cater

Posts: 19616
Nickname: justin78
Registered: Mar, 2011

Justin Cater is executive editor at Java Code Geeks
SQL GROUP BY and Functional Dependencies: A Very Useful Feature Posted: Dec 15, 2015 9:57 PM
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Relational databases define the term “Functional Dependency” as such (from Wikipedia): In relational database theory, a functional dependency is a constraint between two sets of attributes in a relation from a database. In other words, functional dependency is a constraint that describes the relationship between attributes in a relation. In SQL, functional dependencies appear whenever ...

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