Knowing the sparsity of a column helps you decide whether the use of _____ is appropriate.
A) query processing
B) query optimization
C) an index
D) a full table scan

Question

Quizplus · Accepted Answer

If a column is sparse (meaning it has a lot of NULL or empty values), using an index can be beneficial as it can quickly locate the non-NULL values and avoid scanning unnecessary data. This can improve query processing and optimization. A full table scan might not be efficient in this case as it would have to search through all the rows, including the empty ones.

Knowing the Sparsity of a Column Helps You Decide Whether