Cardinality and Modality in ER Model
Cardinality and Modality Cardinality and modality are two different terms in the Database. Let’s see one one by Term Cardinality it shows the maximum number of entities in one entity set, which can be associated with the number of entities of another entity set. Maximum Cardinality can be one or many. One: the cardinality of […]
Relationships in ER Model
Relationships in ER Model In the Entity-Relationship (ER) Model, relationships represent associations among two or more entities. They describe how entities interact with one another in a database. In ER diagrams: Entities are represented by rectangles. Relationships are shown as diamonds. Attributes are ovals connected to entities or relationships. For example: In a university database, […]
Database Languages In DBMS
Database Languages In DBMS Database Languages are specialized languages used to define, manipulate, control, and manage data in a Database Management System (DBMS). They help users create database structures, insert data, retrieve information, and control database access. In simple words: Database Languages = Tools to talk to and control a database. Types of Database Language […]
Data Independence in DBMS
Data Independence in DBMS In Database Management Systems (DBMS), Data Independence refers to the ability to change the database schema at one level without affecting the schema at the next higher level. It ensures that application programs remain unaffected by changes in data storage structure or data access methods. This concept is crucial for database […]
Schema in DBMS
Schema in DBMS In a Database Management System (DBMS), a schema is the logical structure that defines how data is organized in the database. It serves as a blueprint of the database and describes: Tables (relations) Fields/Attributes (columns) Relationships (between tables) Constraints (keys, rules) Views Indexes Important !! Point 01: In the 3-Schema Architecture, the […]
Three Schema Architecture of DBMS
Three Schema Architecture of DBMS The three-schema architecture of DBMS hides the details of the database from the user. Its other name is Three Levels of Abstraction. The database administrator should be able to change the structure of the database according to need without affecting the user’s view. This effective three-schema architecture has three layers, […]
File System Vs DBMS
File System Vs. DBMS When it comes to storing and managing data, two common options are available: File Systems and Database Management Systems (DBMS). While both serve the purpose of storing data, they are fundamentally different in how they handle and organize that data. In this article, we’ll compare File Systems and DBMS, highlighting their […]
Structured Vs Unstructured Database
Structured vs Unstructured Database In the modern world of data management, understanding the distinction between structured and unstructured databases is crucial for making informed decisions about data storage, retrieval, and analysis. Whether you’re managing a small business or a large enterprise, the type of database you choose can significantly impact your operational efficiency. In this […]
Introduction of DBMS (Database Management System)
Introduction of DBMS (Database Management System) A DBMS (Database Management System) is software that helps manage, store, and retrieve data in an organized way. It allows users to create, update, and query databases easily. A cylindrical structure represents the database storage Key features: Data Integrity: Ensures the accuracy and consistency of data. Data Security: Protects […]
TCP/IP Protocols
TCP/IP Protocols The TCP/IP model is based on standard protocols that were developed by the Department of Defense (DoD) in the 1960s. It contains 4 layers, unlike the 7 layers in the OSI model. The four layers are: Process/Application Layer Host-to-Host/Transport Layer Internet Layer Network Access/Link Layer TCP/ IP is the protocol suite used for […]
Communication Devices
Communication Devices Communication devices are hardware that are used on both ends (sender and receiver) to transmit data. The Communication device at the sending end sends the data through a communication medium. The Communication device at the receiving end receives the data through a communication medium. Communication devices may convert analog data to digital data […]
Telephone Networks (PSTN)
Telephone Networks (PSTN) Public switched telephone networks (PSTN) is a worldwide telephone system that manages telephone calls. PSTN use one of the following technique to establish a communication link Fiber optic Telephone lines Satellite communication Microwave transmission links Cellular networks It is also used in computer communications through the internet by using dial-up lines or […]
Home Networks
Home Networks A network of multiple computers at home is a home network. There are different types of home networks, which are explained below, 1. Ethernet network Ethernet is a wiring network that was started in the early 80’s with coaxial cable. Now, it’s upgraded and successfully works with twisted pair cables and fiber optic […]
Network Protocols
Network Protocols Network protocols are a set of rules or standards used by networks for communication of different devices connected to a network. Protocols define what, when, and how to communicate. Devices can’t communicate without protocols. Different layers of the OSI model use different protocols. Function of protocols There are several functions of protocols discussed […]
Server and Its Types
Server and Its Types A server is a powerful computer or system that provides resources, services, or data to other computers (clients) over a network. It plays a critical role in modern computing environments, including cloud computing, web applications, and enterprise systems. What is a Server? A server is a system designed to store, process, […]
Types of Computer Networks
Types of Computer Networks There are two major types of computer networks. One is LAN, and the other is WAN. Let’s explain both these terms 1. LAN In a Local Area Network (LAN), a group of computers are connected to each other within a limited area like an office, building, etc. Communication Medium: Twisted pair, […]
Network Architecture
Network Architecture Network architecture is the design of computers and other devices in a network. There are two types of network architecture 1. Peer-to-peer Network (P2P) In a P2P network, all computers have the same status. It means all computers in this network can share hardware and data. Network OS and application software are installed […]
Computer Networking Introduction
Computer Networking Introduction Computer networking consists of a group of devices that are connected through a Transmission Medium for the purpose of sharing resources. Group of Devices may include Mobiles, Laptops, PCs Printers, etc. Transmission Medium may include any physical cable or wireless medium for data transmission. Resources may include printers, hard disks, scanners, etc. […]
Binary Search Tree
Binary Search Tree in Data Structure In a binary search tree, the node has two types Leaf node: it contains no nodes (children). Non-leaf node: It contains one or two nodes. Non-leaf nodes are also called internal nodes. Conditions for Binary Search Tree are given under The left sub-tree of a node contains only nodes with […]
Tree Traversals And Its Types
Tree Traversals And Its Types Reading/Processing the data of a node exactly once in the some order in a tree. The following ways are generally used for traversing a tree. There are two major types of Tree Traversals 1. Depth first I. Preorder Traversal II. Inorder Traversal III. Postorder Traversal 2. Breadth-First or Level Order […]