Weak Entity Set :
In a relational database, a weak entity is an entity that can not be uniquely
identified by its own 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.In entity relationship diagrams(ER diagrams),a weak entity set
is represented by bold or double lined rectangle connected by a
bold or double lined arrow to a bold or double lined diamond .
This type of relationship is called an Identifying relationship.
Strong Entity Set :
An entity set that has a primary key is called strong entity set.
- Identifying :শনাক্ত করা
- Conjunction :সংযোগ
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