Essential RDBMS Interview Questions and Answers
1. What is RDBMS?
Answer (1 Mark): RDBMS (Relational Database Management System) is a database system that stores data in tables and maintains relationships between the tables.
Probability: ⭐⭐⭐⭐⭐ (Very High – 90%)
2. What is a database?
Answer (1 Mark): A database is an organized collection of related data stored electronically for easy access and management.
Probability: ⭐⭐⭐⭐⭐ (Very High – 85%)
3. What is a Database Management System (DBMS)?
Answer (1 Mark): A DBMS is software
Read MoreBuilding a Flutter Employee Salary Calculator App
Flutter Employee Salary Management System
This example demonstrates how to create a simple Flutter application to manage employee data and calculate gross salary based on specific criteria.
1. Core Data Model
import 'package:flutter/material.dart';
void main() { runApp(MyApp()); }
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(home: EmployeeEntryScreen());
}
}
class Employee {
String name, id, designation;
double basicSalary;Computer Graphics: Essential Concepts and Techniques
Display Devices
Display devices are used to display graphical output generated by a computer.
1) CRT (Cathode Ray Tube)
- Uses an electron beam to strike a phosphor screen.
- The beam scans line by line to produce an image.
- Used in old monitors and TVs.
- Advantages: Good color quality.
- Disadvantages: Heavy, bulky, high power consumption.
2) LCD (Liquid Crystal Display)
- Uses liquid crystals to control light.
- Requires a backlight.
- Thin, lightweight, and consumes less power.
- Used in laptops and mobile phones.
3) LED
Read MoreData Communication and Networking Fundamentals
Fundamentals of Data Communication
Data communication is the exchange of data between devices through a transmission medium.
5 Core Components
- Sender
- Message
- Transmission medium
- Receiver
- Protocol
Effective Communication Requirements
- Delivery: Correct destination
- Accuracy: No errors
- Timeliness: On time
Telecommunication is communication over long distances. Data communication refers specifically to digital data exchange.
Transmission Media
Guided (Wired)
- Twisted pair: Cheap, short distance, more noise
- Coaxial: Better
Additive Manufacturing Processes and Data Formats Explained
Laser Engineered Net Shaping (LENS)
Laser Engineered Net Shaping (LENS) is a powder-based Additive Manufacturing process used for direct metal deposition. It operates using a high-power laser and metal powder feed system. In this process, a focused laser beam creates a molten pool on a metallic substrate. Simultaneously, metal powder is delivered through a nozzle into the melt pool. The injected powder melts instantly and solidifies upon cooling, forming a metallurgically bonded layer. The deposition
Read MoreEssential Java Design Patterns Implementation
Composite Pattern
interface AComponent { int size(); }
public class File implements AComponent { private String name; private int size; public File(String name, int size) { super(); this.name = name; this.size = size; } public int size() { return size; } }
public class Directory implements AComponent { private List<AComponent> children; public Directory(String name) { children = new LinkedList<>(); } public int size() { int result = 0; for (AComponent child : children) result = result +
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