Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test DBMS Query Language Relational Model
Consider the following statements regarding key -
(I) A super key is an attribute or combination of attributes that uniquely identify records in an RDBMS table.
(II) A candidate key is a subset of a super key.
(III) All super keys are candidate keys but vice versa is not true.
1
Only (I) is true
2
(I) and (III) are true
3
Only (II) is true
4
(I) and (II) are true
5
None of the above/More than one of the above