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In the context of databases, cardinality refers to the uniqueness of data values contained in a column.
How does cardinality work?
The quantity of fundamental (cardinal) members of a set is referred to as cardinality. Both infinite and finite forms of cardinality exist. The cardinality of the set of individuals living in the United States, for instance, is roughly 270,000,000; the cardinality of the set of integers is incalculably limitless.
For databases with discrete values, high cardinality is appropriate. Consider the case where each line item has its own specific ID number, description, email address, etc. The term "low cardinality" refers to a column that has many repeated values. It's critical to evaluate your process before using it because different people calculate cardinality in different ways.
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