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Question:
1. A composite primary key is a primary key consisting multiple columns
2. If foreign key is not null, it can be a part of primary key
3. No part of primary key can be null
4. Foreign key must match an existing primary key value
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Which is an incorrect statement
1. A composite primary key is a primary key consisting multiple columns
2. If foreign key is not null, it can be a part of primary key
3. No part of primary key can be null
4. Foreign key must match an existing primary key value
Check Answer
