Multiplicity of Associations¶
The multiplicity of an association represents how many rows there are in one view for each row of the other.
For example, let us say that you create an association between the view
customer and the view
order, the multiplicity at the endpoint
customer (role name
1 and at the endpoint
order (role name
*. This indicates that for
each row of the
customer view there are zero, one or more rows in
order table; and for each row in the
order view there is one
and only one row in the view
0..1indicates a multiplicity of 0 or 1.
1indicates a multiplicity of 1.
- * indicates a multiplicity of 0 or more.
+indicates a multiplicity of 1 or more.