Introduction to Database System Which of the following is not a restriction for a table to be a relation? No two rows in a table may be identical. All of the entries in any column must be of the same kind. The columns must be ordered. The cells of the table must contain a single value. No two rows in a table may be identical. All of the entries in any column must be of the same kind. The columns must be ordered. The cells of the table must contain a single value. ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System Which type of entity is related to two or more associated entities that each contain specialized attributes that apply to some but not all of the instances of the entity? Subtype entity Archetype entity Instance entity Supertype entity Subtype entity Archetype entity Instance entity Supertype entity ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System The degree of a relationship refers to the number of entity classes in the relationship. True False True False ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System Two files may be joined into a third file if both (b) and (c) they have a field in common they have no records with the same value in the common field None of these they have a row in common both (b) and (c) they have a field in common they have no records with the same value in the common field None of these they have a row in common ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System A primary key is a composite key that was selected to be the main identifier for the relation. True False True False ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System Which of the following contains a complete record of all activity that affected the contents of a database during a certain period of time? report writer None of these data manipulation language query language transaction log report writer None of these data manipulation language query language transaction log ANSWER DOWNLOAD EXAMIANS APP
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