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I have the following E-R diagram to refer to: enter image description here

I have a question posed to me that entity 4 IS a weak entity due to one of its relations. However, from what I see, entity 4 has a composite primary key made up of l, m, and n, none of which are partial keys and weak entities would not have any primary keys, only foreign or partial keys. I only see the relationship between entity 3 and 4 somehow causing it to be a weak entity, but I am unsure. I saw this post already, but it almost re-iterated what I was thinking unless I understood it wrong.

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    And what is exactly your question? Commented Apr 8, 2022 at 19:45
  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. Commented Apr 8, 2022 at 20:10

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