Which of the following is a characteristic of a weak entity?
Practice Questions
Q1
Which of the following is a characteristic of a weak entity?
It can exist independently of other entities
It has a primary key of its own
It relies on a strong entity for its identification
It cannot have attributes
Questions & Step-by-Step Solutions
Which of the following is a characteristic of a weak entity?
Correct Answer: A weak entity relies on a strong entity for its identification.
Step 1: Understand what an entity is. An entity is something that can be identified and has data associated with it, like a person or a product.
Step 2: Learn the difference between strong and weak entities. A strong entity has its own unique identifier called a primary key.
Step 3: Know that a weak entity does not have its own primary key. It cannot be identified by itself.
Step 4: Realize that a weak entity depends on a strong entity for its identification. It usually has a partial key that, when combined with the strong entity's key, can uniquely identify it.
Step 5: Conclude that a characteristic of a weak entity is that it relies on a strong entity for identification.
