I'm drawing an ERD for a database and want to know if you need to include the supertypes and sub-types in the ERD. If yes, how to represent it. Thanks.
ERD including supertype, subtype database
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google for "ER Specialization". This is the term used in ER literature for subtyping. You should get some ways to diagram it, using the "Is-a" triangle connector. Some tutorials place it in "Extended ER features".