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Specifies a key that that is only partially unique. Used for weak entities.

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13y ago

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What is partial key in RDBMS?

When a database table has a key which consists of more than one field, a partial key refers to any one of those fields.


Difference between partial dependency and fully functional dependency?

The difference is that partial dependency is when a database's attribute is only partially dependent on the primary key. Fully functional dependency is when the attribute is entirely dependent on the key.


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When a database table has a key which consists of more than one field, a partial key refers to any one of those fields.


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Found a nice explanation here: http://www.e-consultancy.com/knowledge/glossary/1163/partial-functional-dependency.html In database terminology, a partial functional dependency occurs when the value in a non-key attribute of a table is dependent on the value of some part of the table's primary key (but not all of it).


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Partial dependency occurs in a database when a non-prime attribute is dependent on only a part of a composite primary key, rather than on the whole key. For example, in a table with a composite primary key consisting of StudentID and CourseID, if the attribute InstructorName is dependent only on CourseID, then this is a partial dependency. It indicates that the design can be improved by normalizing the database to eliminate such dependencies.


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Diffentiate between full and partial dependency?

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