Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test DBMS Query Language Relational Model
Assume that AB → C, C → D and D → A are simultaneously satisfied by a relation r(R). What are the candidate keys of this relation?
1
AB, CD and AD
2
AB and CD
3
AB and DB
4
More than one of the above
5
None of the above