Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test DBMS Query Language Relational Model
A field in a table can be taken as a foreign key if
1
It is present in all other tables
2
It has unique values
3
Is a primary key in some other table
4
More than one of the above
5
None of the above