In the context of ER modeling, what does a 'weak entity' depend on?

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Question: In the context of ER modeling, what does a \'weak entity\' depend on?

Options:

Correct Answer: A strong entity

Solution:

A weak entity depends on a strong entity for its existence and does not have a primary key of its own.

In the context of ER modeling, what does a 'weak entity' depend on?

In the context of ER modeling, what does a 'weak entity' depend on?

Step 1: Understand what an entity is in ER modeling. An entity is something that can be identified and has data associated with it.
Step 2: Learn about strong entities. A strong entity has its own unique identifier called a primary key.
Step 3: Know what a weak entity is. A weak entity is an entity that cannot be uniquely identified by its own attributes alone.
Step 4: Realize that a weak entity relies on a strong entity. It needs the strong entity to help identify it.
Step 5: Understand that weak entities do not have a primary key of their own. Instead, they use a combination of their attributes and the primary key of the strong entity they depend on.

Weak Entity – A weak entity is an entity that cannot be uniquely identified by its own attributes alone and relies on a strong entity for its identification.
Strong Entity – A strong entity is an entity that can be uniquely identified by its own attributes and has a primary key.
Primary Key – A primary key is a unique identifier for a record in a database table.