2 votes 2 votes In ER model, which of the following is TRUE about weak entity Weak entity is not always existence dependent i.e., weak entity can exist without the entity with which it has a relationship Weak entity has a primary key that is partially or totally derived from the parent entity in a relationship Only I Only II Both I and II Neither I nor II Databases er-diagram + – Mk Utkarsh asked Jan 14, 2019 recategorized Jan 14, 2019 by Shaik Masthan Mk Utkarsh 1.1k views answer comment Share Follow See all 14 Comments See all 14 14 Comments reply Show 11 previous comments Deepanshu commented Jan 14, 2019 reply Follow Share when i read 2nd statement thats what i think they are saying weak entity has primary key means they specify yes primary key we have already then they say it is partial derived or fully derived from table both cases are possible 0 votes 0 votes Shaik Masthan commented Jan 14, 2019 reply Follow Share i didn't get you brother @deepanshu 0 votes 0 votes DAWID15 commented Dec 28, 2021 reply Follow Share weak entities don’t have primary key they have partial keys. So I think(not sure) 2 statement is also false. 0 votes 0 votes Please log in or register to add a comment.
0 votes 0 votes Total participation is also called Existence Dependencies. Weak entity have always a total participating constraint because they cannot be identified without an owner entity. Hence, option 1 is simply wrong from the definition itself. AkashChandraGupta answered Oct 7, 2019 AkashChandraGupta comment Share Follow See 1 comment See all 1 1 comment reply moin commented Aug 16, 2022 reply Follow Share Point 1 is straight false. No doubt about it. but please clear about point 1 0 votes 0 votes Please log in or register to add a comment.