Cardinality
The number of Tuples in a Relation's Body, or more simply the number of data rows in a table.
Example:
| UserId | UserName | Password | |
|---|---|---|---|
| 1 | AJones | alex.jones@abc.com | ######## |
| 2 | BSmith | bob.smith@def.com | ######## |
| 3 | CBloggs | chris.bloggs@xyz.com | ######## |
From the table above the Cardinality would be 3.