Which of the Following Statements About Columnar Databases A), B)

question 15

Multiple Choice

Which of the following statements about columnar databases a) , b) or c) is false?

• A) A columnar database is similar to a relational database, but it stores unstructured data in columns rather than rows.
• B) Because all of a column's elements are stored together, selecting all the data for a given column is more efficient.
• C) Consider our authors table in the books database: first last
• Id
• 1 Paul Deitel
• 2 Harvey Deitel
• 3 Abbey Deitel
• 4 Dan Quirk
• 5 Alexander Wald
• If we consider each row as a Python tuple, the rows would be represented as (1, 'Paul', 'Deitel'), (2, 'Harvey', 'Deitel'), etc. In a columnar database, all the values for a given column would be stored together, as in (1, 2, 3, 4, 5), ('Paul', 'Harvey', 'Abbey', 'Dan', 'Alexander') and ('Deitel', 'Deitel', 'Deitel', 'Quirk', 'Wald').
• D) All of the above statements are true.

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