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It is possible to have a relation that does not have a key.
Q7: A row can be uniquely identified by
Q11: The DBMS ranked as having the "most
Q12: One of the important properties of an
Q13: A categorization relationship is a IS-A relationship.
Q26: What structures are located in the mediastinum?
Q32: To represent an association pattern in an
Q34: The problem of misspelled data entries is
Q36: A null value is an attribute value
Q49: In a supertype-subtype structure,discriminator attributes _.<br>A)are easily
Q84: Only two tables can be queried by