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Why primary key value always not null?
[closed]
tanwardivya
asked
in
Databases
Jan 11, 2017
closed
Jan 14, 2017
by
Sushant Gokhale
212
views
0
votes
0
votes
closed with the note:
Check the definition of primary key
tanwardivya
asked
in
Databases
Jan 11, 2017
closed
Jan 14, 2017
by
Sushant Gokhale
by
tanwardivya
212
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If a primary Key consist of multiple attributes/fields then can it possible that one of the attribute/field have NULL values??? For Example -> If a Relation R(A,B,C) have primary Key as AB then A , B both cannot be NULL but can it possible either A or B have NULL values?
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Which of the following statement is true? (a) Primary key constraint cannot be disabled, it can only be dropped. (b) Primary key constraint cannot be disabled and dropped. (c) Primary key constraint can be disabled and can be dropped. (d) None of the above
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