Question: Consider the following query: Select DISTINCT B, C FROM R The question is below. Answer is also provided. MY QUESTION: I don't understand why the

Consider the following query: Select DISTINCT B, C FROM R

The question is below. Answer is also provided.

MY QUESTION: I don't understand why the reading cost is 600. If we are just reading B and C, shouldn't the reading cost be 400?

Consider the following query: Select DISTINCT B, C FROM R The question

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