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Factorial of a non-negative integer, is multiplication of all integers smaller than or equal to n. For example factorial of 5 is 5*4*3*2*1 which is 120.

A prime number is a whole number greater than 1 whose only factors are 1 and itself.

Enter value of $n

<?php
$n = 2;
$array = array(44,16,81,12);
$unique = array();
$unique = array_unique($array);
sort($unique);
echo $height = $unique[count($unique)-$n];
?>

There are three way to find min value in array

There are three way to find max value in array

Swap number without third variable.

<?php
	$a=12;
	$b=15;
	$a=$a+$b;
	$b=$a-$b;
	$a=$a-$b;
	
	echo $a."<br />".$b;
?>

Print only odd number

<?php
for($i=1; $i<=25; $i++) {
	if($i%2 == 0) {
		$even[] = $i;
	} else {
		$odd[] = $i;
	}
}
echo implode(",",$odd);
?>

Create Table

  • CREATE TABLE MyGuests(id INT AUTO_INCREMENT PRIMARY KEY NOT NULL, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, email VARCHAR(50))

Primary Key

  • Primary key cannot have a NULL value.
  • Each table can have only one primary key.
  • By default, Primary key is clustered index and data in the database table is physically organized in the sequence of clustered index.

  • Where clause can be applied to a single row, where as Having clause is applied to the whole group.
  • Having clause is used, when we want to use select query to filter data from a table based on a aggregate condition