DATA

Data Modeling

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A data model is a conceptual representation of the data structures that are required by a database. The data structures include the data objects, the associations between data objects, and the rules which govern operations on the objects. As the name implies, the data model focuses on what data is required and how it should … Read more

Data Models

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Underlying the structure of a database is the data model: a collection of conceptual tools for describing data, data relationships, data semantics, and consistency constraints. To illustrate the concept of a data model, we outline two data models in this post: the entity-relationship model and the relational model. Both provide a way to describe the … Read more

Two Dimensional Array

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Two dimensional arrays are also called table or matrix, two dimensional arrays have two subscripts Two dimensional array in which elements are stored column by column is called as column major matrix Two dimensional array in which elements are stored row by row is called as row major matrix First subscript denotes number of rows … Read more

Introduction to Data Structure

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Computer is an electronic machine which is used for data processing and manipulation. When programmer collects such type of data for processing, he would require to store all of them in computer’s main memory. In order to make computer work we need to know Representation of data in computer. Accessing of data. How to solve … Read more

Why do we need data structures?

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Data structure is a particular way of storing and organizing information in a computer so that it can be retrieved and used most productively. Different kinds of data structures are meant for different kinds of applications, and some are highly specialized to specific tasks. Data structures are important for the following reasons: 1. Data structures … Read more