Database Design: Integrity, Life Cycle, Views, and Schema
Data Integrity and Completeness
Tell me everything you know about the integrity of the data in separate files.
The problem of data integrity is ensuring that the information in the database is correct. Values of the data stored in files must be valid and meaningful (logical data) and subject to certain restrictions and certain types of format constraints.
Examples:
- That the stock of a particular item is never negative.
- That if the maximum weekly work hours under a particular convention is 35 hours, in
Haskell Code Snippets: Functions, Lists, and File I/O Examples
Functions
--add5 :: Num a => a -> a
add5:: Double -> Double
add5 x=x+5
--Ex1
hello :: [Char] -> [Char]
hello s= "Hello "++s++" :D"
--Ex2
volume :: Num a => a -> a -> a -> a
volume x y z = x*y*z
--Ex3
doubleMe x= 2*x
myNumbers=[11..99]
myNumbers'=map doubleMe myNumbers
mod13 x = [k | k<-x,mod k 13==0]
--Ex4
initial n s =[head n] ++"."++[head s]++"."
--Ex5
unitaryN n= [[if j==i then 1 else 0 | j<- [1..n]] | i<- [1..n]]
--Ex6
list6 =[100*a+10*b+c |a<-[1..9] Read More
Data Mining Fundamentals: Techniques and Applications
What Is Data Mining?
Data mining involves using efficient techniques for the analysis of very large collections of data and the extraction of useful and possibly unexpected patterns within that data.
Why Is Data Mining Important?
- Data Explosion: Enormous volumes of digital data are generated every second from sources like social media, transactions, sensors, web logs, etc.
- Complexity: Data comes in various forms, including tables, graphs, time series, and images.
- Competitive Edge: Companies like Google,
Web Applications, Multimedia Concepts, and Architectures
A web application is an application that users access via a web server over the Internet or an intranet using a web browser.
Well-known examples include webmail applications, wikis, weblogs, and online shops.
Web interfaces may have limitations in the functionality offered to the user.
A significant advantage is that web applications generally work the same regardless of the operating system or version installed on the client machine.
Hypertext is a technology that organizes an information base into
Read MoreJava Programming Test: Circle Class & Digit Sum Exercise
Test 1
Programming I
Monday, September 29, 2008
Name: ____________________________________________________________
Part A: Circle Class Implementation
Given the Circle class defined with the following attributes and method signatures:
Circle Class Definition
public class Circle {
private int radius;
private int x, y;
// Constructor with parameters
public Circle(int x, int y, int radius) { /* implementation */ }
// Default constructor (initializes with zeros)
public Circle() {Core Java Concepts and Programming Principles
OOP Characteristics Explained
Object-Oriented Programming (OOP) encompasses several key characteristics:
- Encapsulation: Wrapping data (variables) and methods (functions) that operate on the data into a single unit, known as a class.
- Abstraction: Hiding complex implementation details from the user and exposing only the essential functionality or features of an object.
- Inheritance: Enables a new class (subclass or derived class) to inherit properties and behaviors (methods) from an existing class (superclass