数据库系统概论5版2016chp06分析.pptx

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An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;数据库模式之一的一个实例;? ;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;函数依赖;An Introduction to Database System;An Introduction to Database System;五、数据依赖对关系模式的影响;An Introduction to Database System;数据依赖对关系模式的影响(续);;;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;函数依赖(续);函数依赖(续);函数依赖(续);An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;教务数据库模式之一;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System; 例:S-L-C(Sno, Sdept, Sloc, Cno, Grade) ∈1NF S-L-C(Sno, Sdept, Sloc, Cno, Grade) ∈2NF SC(Sno, Cno, Grade) ∈ 2NF S-L(Sno, Sdept, Sloc) ∈ 2NF ;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System; 可得: Sno → Sloc,即S-L中存在非主属性对码的传递函数依 赖,所以S-L ∈ 3NF;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introduction to Database System;An Introdu

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