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Question 15 A(n) ____’s main function is to help you understand the complexities of the
real-world environment.
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Question 16 Students and classes have a ____ relationship.
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Question 17 A(n) ____ join only returns matched records from the tables that are being
joined.
• Question 18 A(n) ____ is an ordered arrangement of keys and pointers.
• Question 19 ____ combines all rows from two tables, excluding duplicate rows.
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Question 20 In the relational model, ____ are important because they are used to
ensure that each row in a table is uniquely identifiable.
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Question 21 A ____ is any key that uniquely identifies each row.
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Question 22 The ____ constraint can be placed on a column to ensure that every row in
the table has a value for that column.
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Question 23 A ____ contains at least all of the attribute names and characteristics for
each table in the system.
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Question 24 ____ yields only the rows that appear in both tables.