===== Crows Feet =====

==== Crows Feet Summary ====

Crows Feet diagrams are used by System Architect and other ERD tool sets to show the cardinality and the type of relationship between two entities.    

=== Crows Feet Diagram Meanings ===

Line endings give the cardinality

^Line Ending^Meaning^
| {{ :techniques:0tomany.gif |}}|has a cardinality of 0 or more|
| {{ :techniques:1tomany.gif |}}|has a cardinality of 1 or more|
| {{ :techniques:0to1.gif |}}|has a cardinality of 0 or 1|
| {{ :techniques:1to1.gif |}}|has a cardinality of exactly one|
|  n to n1..n2  |has a cardinality of n to n1 to n2|


Line types give the nature of the relationship.


^Line Type^Meaning^
| {{ :techniques:identifying.gif |}}|is an identifying relationship|
| {{ :techniques:nonidentifying.gif |}}|is a non-identifying relationship|