If column A in a relational database determines a single value for column B at any point in time, then column B is functionally dependent on column A.

Name: If column A in a relational database determines a single value for column B at any point in time, then column B is functionally dependent on column A.
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Functional dependency in a relational database means that the value of one attribute (column A) determines the value of another attribute (column B), which is exactly described in the statement.

If Column a in a Relational Database Determines a Single