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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.
Aggregation Aggregation is stronger form of association. It represents the "has-a" or "part-of" relationship. An aggregation association depicts a complex object which is comp
sy bcs project of hospital managment system
Benefits of heap files 1. This is a easy file Organisation method. 2. Insertion is somehow capable. 3. Good for bulk-loading data into a table. 4. Best if file
What is horizontal fragmentation? Horizontal fragmentation divides the relation by assuming every tuple of r to one or more fragments
What does authentication refer? Authentication refers to the task of verifying the uniqueness of a person.
Discuss the problem of Spurious tuples and how we may prevent it. Ans: A spurious tuple is, mainly, a record in a database that gets created while two tables are joined bad
, write the relational schema, and draw the new dependency diagrams. Identify the normal forms for each table structure you created
FitAll Ltd is a company that manufactures clothes. Its processes are manual and there are stand-alone Information Systems that aid to manage them. The Information Systems were purc
I need to Map an E-R diagram to a relational schema
Define Atom of domain relational calculus An atom has the outline 1 , x 2 , ... , x n > -> r , in which r stands for a relation on n attributes and x 1 , x 2 , ... , x n ar
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