UGC-NET | UGC NET CS 2017 Jan – III | Question 8
Which one is correct w.r.t. RDBMS ?
(A) primary key ⊆ super key ⊆ candidate key
(B) primary key ⊆ candidate key ⊆ super key
(C) super key ⊆ candidate key ⊆ primary key
(D) super key ⊆ primary key ⊆ candidate key
Explanation: primary key ⊆ candidate key ⊆ super key in RDBMS
For more information Refer:DBMS | Keys in Relational Model (Candidate, Super, Primary, Alternate and Foreign)
Option (B) is correct.
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