Functional Dependency Set Closure (F+) Functional Dependency Set Closure of F is the set of all functional dependencies that are determined by it. Example of Functional Dependency Set Closure : Consider a relation R(ABC) having following functional dependencies : F = { A → B, B → C } To find the Functional Dependency Set closure of…

How to Find Candidate Key using Functional Dependencies – In the previous post (How to Find Super Key from Functional Dependencies), we identify all the superkeys using functional dependencies. To identify Candidate Key, Let R be the relational schema, and X be the set of attributes over R. X+ determine all the attributes of R, and therefore X…

Prime and Non Prime Attributes in DBMS with Example – Prime Attributes – Attribute set that belongs to any candidate key are called Prime Attributes. (union of all the candidate key attribute) {CK1 ∪ CK2 ∪ CK3 ∪ ……} If Prime attribute determined by other attribute set, then more than one candidate key is possible….