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  2. Superkey - Wikipedia

    en.wikipedia.org/wiki/Superkey

    A candidate key (or minimal superkey) is a superkey that can't be reduced to a simpler superkey by removing an attribute. [ 3 ] For example, in an employee schema with attributes employeeID , name , job , and departmentID , if employeeID values are unique then employeeID combined with any or all of the other attributes can uniquely identify ...

  3. Candidate key - Wikipedia

    en.wikipedia.org/wiki/Candidate_key

    A candidate key, or simply a key, of a relational database is any set of columns that have a unique combination of values in each row, with the additional constraint that removing any column could produce duplicate combinations of values. A candidate key is a minimal superkey, [1] i.e., a superkey that doesn't contain a smaller one. Therefore ...

  4. Boyce–Codd normal form - Wikipedia

    en.wikipedia.org/wiki/Boyce–Codd_normal_form

    However, only S 1, S 2, S 3 and S 4 are candidate keys (that is, minimal superkeys for that relation) because e.g. S 1 ⊂ S 5, so S 5 cannot be a candidate key. Given that 2NF prohibits partial functional dependencies of non-prime attributes (i.e., an attribute that does not occur in any candidate key ) and that 3NF prohibits transitive ...

  5. Primary key - Wikipedia

    en.wikipedia.org/wiki/Primary_key

    In the relational model of databases, a primary key is a designated attribute that can reliably identify and distinguish between each individual record in a table.The database creator can choose an existing unique attribute or combination of attributes from the table (a natural key) to act as its primary key, or create a new attribute containing a unique ID that exists solely for this purpose ...

  6. Unique key - Wikipedia

    en.wikipedia.org/wiki/Unique_key

    Definition Simple A key made from only one attribute. Concatenated A key made from more than one attribute joined together as a single key, such as part or whole name with a system generated number appended as often used for E-mail addresses. Compound: A key made from at least two attributes or simple keys, only simple keys exist in a compound ...

  7. Heisman Trophy: Full list of winners for college football’s ...

    www.aol.com/heisman-trophy-full-list-winners...

    The 2024 Heisman Trophy will be awarded on Saturday. Here is a list of past winners for college football's top award, sorted by school.

  8. Distributed hash table - Wikipedia

    en.wikipedia.org/wiki/Distributed_hash_table

    Keys are unique identifiers which map to particular values, which in turn can be anything from addresses, to documents, to arbitrary data. [2] Responsibility for maintaining the mapping from keys to values is distributed among the nodes, in such a way that a change in the set of participants causes a minimal amount of disruption.

  9. 'I want us to put our names on it': Bucks coach Doc Rivers ...

    www.aol.com/want-us-put-names-bucks-035851401.html

    “That’s the word,” Rivers said. “When you do that, accountability comes in, and that’s a good thing.” That’s what the NBA needed for this four-day getaway.