Show pageOld revisionsBacklinksBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ===== 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| techniques/erd.txt Last modified: 01/06/13 @ 20:54:16by 127.0.0.1