Functional dependency defines Boyce-Codd normal form and third normal form. This preserves dependency between attributes, eliminating the repetition of information. Functional dependency is related to a candidate key, which uniquely identifies a tuple and determines the value of all other attributes in t...
dnumdname EnumEnameDnumdname 01John1Research 02Tomas1Research 03Jerry2Finance 4 PrinciplesofDATABASESYSTEMS,Spring2011,guochengliu 单词: TrivialFDsTrivialFDs平凡函数依赖平凡函数依赖 AfunctionaldependencyXYistrivialifYisasubsetofX {name,supervisor_id}{name} Iftworecordshavethesamevaluesonboththenameand ...
functional dependencyBoyce-Codd normal form familiesBCNF/ C6120 File organisation C6160 Database management systems (DBMS)A functional dependency (fd) family was recently defined [20] as the set of all instances satisfying some set of functional dependencies. A Boyce-Codd normal form, abbreviated ...
Functional requirements defines function of the system. We document these requirement properly to give developer, so developer can develop application according to given functional requirement. Hence, functional requirements should be wrritten in simple language to understand. Developer develop the application...