<P> In a relational database , a one - to - one relationship exists when one row in a table may be linked with only one row in another table and vice versa . It is important to note that a one - to - one relationship is not a property of the data , but rather of the relationship itself . A list of mothers and their children may happen to describe mothers with only one child , in which case one row of the mothers table will refer to only one row of the children table and vice versa , but the relationship itself is not one - to - one , because mothers may have more than one child , thus forming a one - to - many relationship . </P>
<P> In a relational database , a one - to - one relationship exists when one row in a table may be linked with only one row in another table and vice versa . It is important to note that a one - to - one relationship is not a property of the data , but rather of the relationship itself . A list of mothers and their children may happen to describe mothers with only one child , in which case one row of the mothers table will refer to only one row of the children table and vice versa , but the relationship itself is not one - to - one , because mothers may have more than one child , thus forming a one - to - many relationship . </P>
what is a one to one relationship in a database
what is a one to one relationship in a database
when one row in a table may be linked with only one row in another table and vice versa
when one row in a table may be linked with only one row in another table and vice versa