Answer by Wye for Unknown symbol in ERD
It does seem to represent supertypes and subtypes. Often the circle will have either a d or an o inside. The d stands for "disjoint" or non-overlapping and the o would stand for "overlapping". These...
View ArticleAnswer by reaanb for Unknown symbol in ERD
It indicates a supertype/subtype relationship. The notation is used in Microsoft Visio, where it's called a category. A double horizontal line is used to indicate a complete category. In your image,...
View ArticleAnswer by Ricky for Unknown symbol in ERD
cardinality symbol, i think one to many symbol
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Unknown symbol in ERD
I was searching for the meaning of the symbol marked in red in the image below, but I didn't get anything. So, do you guys know what it means?
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