This is a classic database design question. A null primary key definitely violates entity integrity, since the primary key is supposed to uniquely identify each record. I'm confident that's the right answer here.
I'm a little confused on the differences between the different types of relational integrity. I'll have to review my notes to make sure I understand which one applies to a null primary key.
Okay, let me think this through. If a primary key has a null value, that means there's no unique identifier for that record, which would violate the entity integrity constraints. I'm pretty sure that's the right answer.
Hmm, I'm not totally sure about this one. I know primary keys are important for maintaining data integrity, but I'm not confident which specific type of integrity is violated by a null primary key.
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