WebAug 28, 2024 · Following are the examples of a super key for the table Student: 1. Student_id 2. (Student_id, Name) 3. (Name, Department_id) Candidate key. A minimal (minimum) set of attributes that can uniquely identify each record in a relation is called a candidate key. It is a subset of a super key. WebFeb 11, 2014 · Minimal Super key is a key which is a super key without any redundant attribute (unnecessary combination). In other words, if you remove any attribute from a key combination, it should not be able to uniquely identify data. That is we need a minimal combination of attributes.
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WebThe minimal set of super key is called State true or false i) A candidate key is a minimal super key. ii) A candidate key can also refer to as surrogate key. Minimal data … WebA minimal super key is called as a candidate key. For any given relation, It is possible to have multiple candidate keys. There exists no general formula to find the total number of … boy toys 6-8 year old
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WebAug 22, 2024 · a) A Super Key is a set of one or more attributes that, taken collectively, allows us to uniquely identify an entity in the entity set. b) A proper subset of a candidate key is called a Super Key. c) The minimal set of attributes that allows us to uniquely identify an entity in the entity set is called a candidate key. WebMar 19, 2016 · Althrough, minimal subset of super key is either id or ssn. but both of them can be considered as candidate key. Primary Key : Primary key is a one of the candidate key. Example : Student(Id, Name, Dept, Result) … WebFeb 27, 2024 · Any superset of a key (primary key or candidate key) is a superkey. Data: n → total number of attributes = 5 n (s) → total number of super keys n (CD) → number of super keys when CD as the key n (E) → number of super keys when E as the key Formula: n (S) = n (CD ∪ E) = n (CD) + n (E) – n (CDE) Calculation: n ( S) = 2 5 − 2 + 2 5 − 1 − 2 5 − 3 gym in selly oak