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I'm looking for a one-page quick-reference or cheatsheet (preferably in PDF) to the meanings of the various ERD symbols in Crowsfoot/Martin notation.
I've done a lot of googling, but have not found a good, concise quick-reference guide, though I'm sure one must exist.
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In entity relationship modeling, solid lines represent strong relationships and dashed lines represent weak relationships.
The primary key of an. entity set is a candidate key that is chosen by the database designer. as the principle means of identifying entities within an entity set. (see Sectiown 4). Dashed Circle: A dashed ellipse represents a derived attribute.
ERD components: Entity, Attribute and Relationship. Cardinality is the number of relationships or instances one entity has with another.
Entity Relationship Diagram Symbols & Notations mainly contains three basic symbols which are rectangle, oval and diamond to represent relationships between elements, entities and attributes. There are some sub-elements which are based on main elements in ERD Diagram.
I've also been looking for a single-page "quick reference" PDF for ERD relationship symbols (i.e. "Crows Feet"). I haven't found anything I've liked, so I created this.
I've posted the Full Page, Printable PDF on my blog.
Hope this helps! 
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