• Question 20 In an outer join, the matched pairs would be retained and any unmatched values in the other table would be left ____.
• Question 21 ____ combines all rows from two tables, excluding duplicate rows.
• Question 22 Since it is used to link the tables that originally were related in a M: N relationship, the composite entity structure includes— as foreign keys— at least the ____ keys of the tables that are to be linked.
• Question 23 ____ yields only the rows that appear in both tables.
• Question 24 A( n) ____ is an ordered arrangement of keys and pointers.
• Question 25 A ____ relationship exists when an association is maintained within a single entity.
• Question 26 A ____ relationship exists when three entities are associated.
• Question 27 A ____ identifier is composed of more than one attribute.
• Question 28 A ____ should be a derived attribute.
• Question 29 If an entity can exist apart from one or more related entities, it is said to be ____-independent.
• Question 30 An entity is said to be ____-dependent if it can exist in the database only when it is associated with another related entity occurrence.
• Question 31 A ____ entity has a primary key that is partially or totally derived from the parent entity in the relationship.