I have been searching all over the internet but I couldn't seem to find an answer that I can understand.
So kindly, if somebody could explain to me with the help of examples what is cardinality in databases?
Thank you.
This question is related to
database
oracle
database-design
cardinality
Definition: We have tables in database. In relational database, we have relations among the tables. These relations can be one-to-one, one-to-many or many-to-many. These relations are called 'cardinality'.
Significant of cardinality:
Many relational databases have been designed following stick business rules.When you design the database we define the cardinality based on the business rules. But every objects has its own nature as well.
When you define cardinality among object you have to consider all these things to define the correct cardinality.
Cardinality of a set is the namber of the elements in set for we have a set a > a,b,c < so ths set contain 3 elements 3 is the cardinality of that set
Cardinality refers to the uniqueness of data contained in a column. If a column has a lot of duplicate data (e.g. a column that stores either "true" or "false"), it has low cardinality, but if the values are highly unique (e.g. Social Security numbers), it has high cardinality.
It depends a bit on context. Cardinality means the number of something but it gets used in a variety of contexts.
PERSON
table, for example, GENDER
is likely to be a very low cardinality column (there are probably only two values in GENDER
) while PERSON_ID
is likely to be a very high cardinality column (every row will have a different value).There are probably other situations where people talk about cardinality using a different context and mean something else.
In database, Cardinality number of rows in the table.
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Source: Stackoverflow.com