Data Modeling - Weak Entity

Question

Data Modeling - Weak Entity

Navigation

#1 by (0 votes)

0

Hello, I am studying about Data Modeling and I have doubts about the concept of Weak Entity.

I have already understood what is Weak Entity, which is an entity that needs keys from other entities in which they relate to then form their composite key.

However, in the Data Modeling book of Professor Carlos Alberto Heuser, he says that the concept of 'weak entity' is not appropriate because this same Entity may be relevant to another Entity.

So, what should I consider about Weak Entity? In practice do we use this concept?

modelagem

asked by anonymous 20.07.2018 / 19:22

1 answer

Events in three.js and CSS do not work on some devices in some sizes webRTC does not show video on iphone

score 0 · Answer 1

If I understood correctly, the teacher gave a other view of what a weak entity is.

We usually define whether an entity is weak or strong by looking only for itself, but from what I understand the teacher understands that someone may be using the supposedly weak entity as the key, then it would cease to be weak . It makes sense to me.

In practice, as a developer, I've never modeled my tables under this concept and have never seen anyone (or DBAs) use or cite this concept to do so.