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Define reference file
what is database management system? & why it is required?
What are called multilevel indices? Indices with two or more levels are known as multilevel indices.
explain exhaustively the problems associated with ER diagrams. include illustrations in your answer
To eliminate duplicate rows (distinct operator) Example: SELECT DISTINCT DEPTNO FROM EMP;
What is Object Oriented model? This model is based on collection of objects. An object has values stored in instance variables with in the object. An object also having bodies
what is natural join?
The PROJECT operation The project operation is used to choose the records with specified attributes as discarding the others based on some related criteria. This is denotes as ∏
Write short notes on extension and intension? In any data model, it is significant to distinguish among the description of the database and the database itself the description
Write short notes on relational constraints? Relational Constraints are: 1. NOT NULL 2. Unique 3. Primary key 4. Foreign key 5. Table check
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