cis.csuohio.eduhttp://cis.csuohio.edu/~sschung/cis430/LectureNotes_DBDesign_ERModel_ShortenUpd.pdfER diagrams vs. EER diagrams: What's the difference? | CacooWhen designing your database, an entity-relationship diagram (ER or ERD) is an excellent way to visually lay out your plan. So what is EER? In some cases, you may want to opt for an enhanced entity-relationship diagram (EER or EERD), which includes a few more elements than ER diagrams do.https://cacoo.com/blog/er-diagrams-vs-eer-diagrams-whats-the-difference
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