Definition of Superkey. Meaning of Superkey. Synonyms of Superkey

Here you will find one or more explanations in English for the word Superkey. Also in the bottom left of the page several parts of wikipedia pages related to the word Superkey and, of course, Superkey synonyms and on the right images related to the word Superkey.

Definition of Superkey

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Meaning of Superkey from wikipedia

- relational data model a superkey is any set of attributes that uniquely identifies each tuple of a relation. Because superkey values are unique, tuples...
- duplicate combinations of values. A candidate key is a minimal superkey, i.e., a superkey that doesn't contain a smaller one. Therefore, a relation can...
- Superkey A superkey is a set of column headers for which the values of those columns concatenated are unique across all rows. Formally: A superkey is...
- ID, Supplier ID}}. No component of that join dependency is a superkey (the sole superkey being the entire heading), so the table does not satisfy the...
- be considered as the table's superkeys. However, only S1, S2, S3 and S4 are candidate keys (that is, minimal superkeys for that relation) because e.g...
- multivalued dependencies X ↠ {\displaystyle \twoheadrightarrow } Y, {X, Y} is a superkey—that is, the combination of all attributes in X and Y is either a candidate...
- subset of X, meaning X → Y is a trivial functional dependency), X is a superkey, every element of Y \ X, the set difference between Y and X, is a prime...
- implied by the candidate key(s) of R if and only if each of A, B, …, Z is a superkey for R. The fifth normal form was first described by Ronald ****in in his...
- primary key is a choice[clarification needed] of a candidate key (a minimal superkey); any other candidate key is an alternate key. In relational database terms...
- domain of discourse). In the relational model of data, a natural key is a superkey and is therefore a functional determinant for all attributes in a relation...