Enhanced Entity-Relationship Model Part 2: Generalization vs. Specialization and EER Constraints

Further detail on the relationship between top-down (specialization) and bottom-up (generalization) EER modeling and our expectations regarding EER model constraints

[@workforceinternational1047]

You sir are a gentleman and a scholar.

[@thetruereality2]

Thank you sir, this helped a lot.

[@mahrou616]

Thank you, Sir

[@flipsmash]

Not quite. A second line from people to the circle would mean that each person in the domain MUST participate in a specialization category. In other words, each person is required to be either an employee or a student or an alum. Whatever the participation constraint, you should elicit and model whatever specialties are useful. If you needed to add additional categories beyond student, employee and alum, you should do so, no matter what the constraints.

[@ipatan]

Thank you so much, great video I wish my teacher could learn from you !

[@le0nz]

Great videos, very useful.
Thanks!!

[@rachelwang7818]

This is very helpful. Thank you!

[@bcp2004]

Id love to use your videos to study but could you pleasssseeee put them all in a playlist that starts with the first introduction video proceeding to the last. Its all over the shop and I dont know where to start

[@keethsamarakoon2607]

thanks for the lecture ...

[@MuhammadRafliYulistiawan]

Thank you, Sir

[@fulanitooriginal]

Unique MC attribute: handle bars, lol

[@ryanfrancisco2721]

Still usable! Thank you so much!

[@rotteliket]

So a second line from People down to the cirkle would indicate that there could be more categories than those three? (Nice video!)

[@boburirgashev4762]

still great explanation, thank you for these tutorial sets

[@RasmusNrgaard]

Great video (videos)...but where is the translation video for this type of diagram?

[@WishIxwasxAxPlatypus]

thanks for your emphasis on each explanation. like in the disjoint and overlapping examples and contrasts. you explained the design choices fro choosing disjoint and overlap more than I could hope for.

[@TheHeadlets]

Thanks so much for the informative video! Really helped me make notes for an upcoming assignment. Appreciate it.

[@chiragvaland2406]

very good and interesting video. it will help me a lot in my future..!

[@chantellefernandez9747]

Saved my life thank you

[@alexr6479]

Great video, helped me more than my professor!

[@ManukaMadurangaa]

Is there any way i can contact you? i have some questions to ask?

[@IraqAllFor]

This is the best tutorial on uTube, thanks a lot, directly to the point thanks. I am waiting for the mapping to tables lesson

[@mim2011]

RAM م

[@saudidreesi]

Thanks Brian, excellent job !

[@NeeleshRajpurohit]

superb explaination sir

[@atomic7680]

Great Videos

[@binbashburns]

Thank you so much.

[@j.a.h.5150]

very good!

[@boniedwin]

thank you so much

[@RalphNgOfficial]

What are the differences between ER and EER?

[@flipsmash]

+Ralph Ng EER includes the generalization/specialization relationship, thus extending the original ER model, which did not include it.

[@dmstwnted007]

sud be mor to the point but gr8