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?

Question

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.

Answer

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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