What is Data Cardinality? - Data warehousing

What is Data Cardinality?

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

Determining data cardinality is a substantial aspect used in data modeling. This is used to determine the relationships.

Types of cardinalities:

The Link Cardinality - 0:0 relationships
The Sub-type Cardinality - 1:0 relationships
The Physical Segment Cardinality - 1:1 relationship
The Possession Cardinality - 0: M relation
The Child Cardinality - 1: M mandatory relationship
The Characteristic Cardinality - 0: M relationship
The Paradox Cardinality - 1: M relationship.
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