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Attributes attached to an entity can be of various types.
Simple
The attribute that cannot be further separated into smaller parts and shows the basic meaning is known as a simple attribute. For instance: The 'First name', 'Last name', age attributes of a person entity signifies a simple attribute.
Composite
Attributes that can be further separated into smaller units and every individual unit have a specific meaning.
For instance:-The NAME attribute of an employee entity can be sub-divided into
First name, Last name and Middle name.
The need for three level architecture The aim of the three level architecture is to divide each user's view of the database from the way the database is physically shown.
triggering
how to write tables and drow E-R diagrams for hosiptal management system and how to normalize and cardinalities?
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