What is Weak Entity set?

• a weak entity is an entity that cannot be uniquely identified by its attributes alone; therefore, it must use a foreign key in conjunction with its attributes to create a primary key. The foreign key is typically a primary key of an entity it is related to.
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• Weak Entity Sets
  
  An entity set that does not have a primary key is referred to as a weak entity set.
  
  The existance of a weak entity set depends on the existence of a strong entity set; it must relate to the strong set via a on-to-many relationship set.
  
  A distriminator of a weak entity set is the set of attributes that distinguishes among all the entities of a weak entity set.
  
  The primary key of a weak entity set is formed by the primary key of the strong entity set on which the weak entity set is existence depend, plus the weak entity set’s discriminator.
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• A weak entity set is an entity set that does not have a primary key .
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