What Is Data Cardinality?
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Cardinality is the term used in database relations to denote the occurrences of data
on either side of the relation.
There are 3 basic types of cardinality:
High data cardinality:
Values of a data column are very uncommon. e.g. email ids and the user names.
Normal data cardinality:
Values of a data column are somewhat uncommon but never unique.
e.g. A data column containing LAST_NAME (there may be several entries of the same last name).
Low data cardinality:
Values of a data column are very usual. e.g. flag statuses: 0/1