Which key uniquely identifies each record in a table?
A super key that has no proper subset which is also a super key is called:
A foreign key in a table references which key in another table?
In an ER diagram, a rectangle represents:
Which is NOT a valid cardinality in an ER relationship?
A weak entity:
Which key can have NULL values?
A super key is:
What does ON DELETE CASCADE do in a foreign key constraint?
In the relational model, a tuple corresponds to:
Which key uniquely identifies each record in a table?
A super key that has no proper subset which is also a super key is called:
A foreign key in a table references which key in another table?
In an ER diagram, a rectangle represents:
Which is NOT a valid cardinality in an ER relationship?
A weak entity:
Which key can have NULL values?
A super key is:
What does ON DELETE CASCADE do in a foreign key constraint?
In the relational model, a tuple corresponds to: