____ refers to the number of different values a column could possibly have.
A) Database statistics
B) Data sparsity
C) Primary keys
D) Query optimization

Question

Quizplus · Accepted Answer

Data sparsity refers to the situation where a large portion of a database column contains null (missing) values. This reduces the number of different values that a column could possibly have. A column with no data sparsity would have the maximum possible number of different values, while a column with high data sparsity would have fewer distinct values. Therefore, data sparsity affects the cardinality of a column, which is the number of distinct values it contains. Options A, C, and D are not related to the concept of cardinality, but rather to other aspects of database management.

____ Refers to the Number of Different Values a Column