Documents Functional Dependencies (FDs). A function dependency on a relation means that some attribute is a...

Slide 1Functional Dependencies (FDs) Slide 2 A function dependency on a relation means that some attribute is a function of a group of other attributes: A4 = f(A1, A2, A3)…

Documents Closure

Closure The closure of {B1…Bk} under the set of FDs S, denoted by {B1…Bk}+, is defined as follows: {B1…Bk}+ = {B | any relation satisfies S will also satisfies B1…BkB}…