Supertype/subtype Hierarchies

[@josibee]

You're the bomb! Thank you for putting this together. Good scenarios, and well presented.

[@ΠαναγιώτηςΧατζηαντωνίου-ι7θ]

Thank you! Great explanation!

[@jean-luckonicek5483]

Thank you for these videos - I appreciate it man.

[@ryanjackson401]

I know this video has been around for a few years, but I just stumbled across this for a database project I was working on - very helpful!

[@JDOS]

great video

[@kso35]

Thank you for this video. A visual of subtype and super type is much easier to understand than the stupid textbook for my college course!! This helped!! btw watching in 2020

[@Selificatu]

Thanks! Good explaination and example.. much better than my lectures in Database Modeling at the university which only teach us about the abstract concepts without examples!

[@soun-youngkwon9110]

Nice explanation on supertype and subtype. However, starting 16:00, the two diagrams are not 'exactly' the same as you claim. If you use subtype notation, the subtype inherits all the attributes of the supertype. If you want to make the right diagram same as the left diagram which uses subtype notation, you will have to add those attributes in Employee explicitly into PT and FT.

[@palesakatane3563]

You've been great, thank you❤ but where's video 4 for overlap and disjointed rules.🥺

[@oshinubisamson853]

Thanks for the video... now it makes sense to me clearly..........

[@Lett3rs4ndNumb3rs]

Well done, very helpful. Thanks!

[@chind0na]

2:56
Artificial Intelligences in the future building databases: come again?

[@williamblair1123]

Subtypes are actually created as separate tables in the db?

[@Rekker420_1]

Thank you, this video was very helpful.

[@gamer7234]

Hell yeah

[@ungeheurenungeziefer2662]

Still pretty actual! Thanks

[@Ahoto_papa_bi]

hey. What the name of the software you are drawing and writing in? thank you.

[@yosualijantobinar3375]

Thank you, the discriminator of super-type saves me alot.

[@Happen2Bme]

Thank you so very much....

[@madhurich6257]

Can you share the answers for the exercise question?

[@omaniyoutuber9043]

well don thank you my teacher