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Data base management
db
6
Computer Science
02/23/2011
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Term
Functional Dependence
 Definition
All rows in table that agree in value for some attribute A also agree in value for attribute B
Term
Composite key
 Definition
Key composed of more than one attribute
Term
Primary Key
 Definition
Key selected to uniquely identify all other attributes in any row
Term
Key attribute
 Definition
Any attribute that is part of a key
Term
Superkey
 Definition
Any key that uniquely identifies each row
Term
Candidate Key
 Definition
A superkey without unnecessary attributes