Cardinality Ratioa
« Previous Next »Cardinality Ratio
The cardinality ratio for a binary relationship specifies the number of relationship instances that an entity can participate in. There are three types of cardinality ratios for binary relationships. one-to-one (1: 1) one-to-many (1 : N) many-to-many.(N : M)
one-to-one
![](images\DBMS_One_To_One.png)
one-to-many
![](images\DBMS_One_To_Many.png)
many-to-many
![](images\DBMS_Many_To_Many.png)