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This program checks whether a number is a Special Number or not in JAVA

  This program checks whether a number is a Special Number or not. A number is said to be a special number when the sum of the factorial of its digits is equal to the number itself. Example - 145 is a Special Number as 1!+4!+5!=145. Program- /*import java.util.*; public class SpecialNumberCheck {      public static void main(String args[])      {           Scanner ob=new Scanner(System.in);           System.out.println("Enter the number to be checked.");           int a=ob.nextInt();           int sum=0,b=a;           while(a!=0)//or a>0           {                int rem=a%10; int fact=1;                for(int i=1;i<=rem;i++)      ...
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Difference between Primary Key , Foreign Key & Candidate Key

 Last Updated: 23-02-2021 Primary Key: A primary key is used to ensure data in the specific column is unique. It is a column that cannot have NULL values. It is either an existing table column or a column that is specifically generated by the database according to a defined sequence. Example: Refer to the figure – STUD_NO, as well as STUD_PHONE both, are candidate keys for relation STUDENT but STUD_NO can be chosen as the primary key (only one out of many candidate keys). Foreign Key: A foreign key is a column or group of columns in a relational database table that provides a link between data in two tables. It is a column (or columns) that references a column (most often the primary key) of another table. Example: Refer to the figure – STUD_NO in STUDENT_COURSE is a foreign key to STUD_NO in STUDENT relation. Figure: Let’s see the difference between Primary Key and Foreign Key: PRIMARY KEY A primary key is used to ensure data in the specific column is unique. It uniquely identifie...
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Python Methods with Description.

Python includes following list methods  1) list.append(obj) = Appends object obj to list  2) list.count(obj) = Returns count of how many times obj occurs in list  3) list.extend(seq) = Appends the contents of seq to list 4) list.index(obj) = Returns the lowest index in list that obj appears 5) list.insert(index, obj) = Inserts object obj into list at offset index 6) list.pop(obj=list[-1]) = Removes and returns last object or obj from list 7) list.remove(obj) = Removes object obj from list 8) list.reverse() = Reverses objects of list in place 9) list.sort([func]) = Sorts objects of list, use compare func if given Function with Description 1) cmp(tuple1, tuple2) = Compares elements of both tuples. 2) len(tuple) = Gives the total length of the tuple. 3) max(tuple) = Returns item from the tuple with max value. 4) min(tuple) = Returns item from the tuple with min value. 5) tuple(seq) = Converts a list into tuple. Built-in Dictionary Functions & Methods Python includes ...
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