In column family databases such as Cassandra, using valueless columns can optimize data modelling. Which statement best describes the purpose and benefit of valueless columns?

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Answer

They store compressed values to reduce disk space without changing query logic.

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They are used only for indexing and cannot be queried directly.

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They represent the presence or absence of a column itself as a flag, reducing storage needs and simplifying queries.

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They automatically infer data types for missing values during read operations.

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In column family databases such as Cassandra, using valueless columns can optimi...

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