数据库原理之数据库设计

First Normal Form

Domain is atomic if its elements are considered to be indivisibe units.
A relational schema R is in first normal form if the domains of all attributes of R are atomic.
N0n-atomic values complicate storage and encourage redundant storage of data.
Design Goals:
        Avoids redundant data
        Ensure that relationships among attributes are represented
        Facilitate the checking of updates for violation of database integrity constraints.