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Question: If K is a foreign key in a relation R1 then
1. Every tuple of R1 has a distinct value for K
2. K cannot have a null value for tuples in R1
3. K is a key for some other relation
4. K is a primary key for R1
Check Answer
1. Every tuple of R1 has a distinct value for K
2. K cannot have a null value for tuples in R1
3. K is a key for some other relation
4. K is a primary key for R1
Check Answer
