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What is a Data Flow Diagram?
Data Flow Diagram: A data flow diagram is the graph that shows flow of data values from their sources in objects in the course of processes which transform them to their destinations in other objects.
It does not show how values are controlled while computation. The Data Flow Diagram shows functional relationship of values computed by a system. DFD contains processes which transform data, data flows which move data, actor objects which produce and consume data and data store objects which store data passively.
Candidate Key: In a relation R, a candidate key for R is a subset of the set of attributes of R, which have the differnt two properties: (1) Uniqueness: N
Write short notes on tuple relational calculus. The tuple relational calculation is anon procedural query language. It defines the desired information without giving a particul
For every multivalued attribute 'A', we make a new relation R that contains an attribute corresponding to plus the primary key attribute k of the relation that shows the entity typ
Explain outer join? Outer Join - If there are any values in one table which do not have corresponding value(s) in the other, in an equi-join which will not be chosen. Such ro
how to prepare a data dictionary for online examination system for certified courses?
What is substitutability? Any method of a class-say A can equally well be adjured with any object belonging to any subclasses B of A. This characteristic leads to code reuse, a
Lack of Redundancy We have talked about the problems of repetition of information in a database. Such repetition should be stay away as much as possible. Let us state once again t
What is bucket overflow and how bucket overflow is handled through Over Flow Chaining or Closed Hashing? Ans: Bucket: unit of storage holding records. Bucket is a disk block
What is Relational Algebra? Relational algebra is a Procedural query Language?
In this assignment, you will create a program that works with multiple tables. In this assignment, you will work with the factory and sales tables. 1. Create a new project nam
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