PHP-My SQL avg() aggregate function

Last Updated : 22 Mar, 2021

In this article, we are going to find the average of the column in the SQL database using PHP in Xampp server. We are taking an example of a food database to find the average cost of all the items of food. Let's discuss it one by one.

Requirements - Xampp server

Introduction :
Here, we will see the overview of the MySQL and AVG() function.

MySQL -
MySQL is a database query language used to manipulate databases.
AVG() -
AVG stands for average which is used to find the average value of the specified expression, which accepts only one parameter namely expression.

Approach :
Here, we will discuss the approach to implement to find the average of the column in the SQL database using PHP in Xampp server as follows.

Create a table in a database.
Insert the records into the table using PHP.
PHP's code to find an average of a particular column.

Steps to implement :

Starting xampp server.

Create table(food) in a database(geek) and insert records into it by writing PHP code(data1.php).

PHP Code Implementation :

PHP

<?php
//servername
$servername = "localhost";
//username
$username = "root";
//empty password
$password = "";
//geek is the database name
$dbname = "geek";

// Create connection by passing these connection parameters
$conn = new mysqli($servername, $username, $password, $dbname);
// Check this connection
if ($conn->connect_error) {
  die("Connection failed: " . $conn->connect_error);
}
//insert records into table
$sql  = "INSERT INTO food VALUES (1,'fry',345,20);";
$sql .= "INSERT INTO food VALUES (2,'cakes',1020,100);";
$sql .= "INSERT INTO food  VALUES (3,'chocos','200',10);";
$sql .= "INSERT INTO food  VALUES (4,'milk',200,50);";

if ($conn->multi_query($sql) === TRUE) {
  echo "food data stored successfully";
} else {
  echo "Error: " . $sql . "<br>" . $conn->error;
}
//close the connection

$conn->close();
?>

Type “localhost/data1.php” in your browser.

Type PHP code(form.php) to find the average cost of food items.

Example-1 :
PHP's code to find the average weight of items as follows.

PHP

<html>
<body>
<?php
//servername
$servername = "localhost";
//username
$username = "root";
//empty password
$password = "";
//geek is the database name
$dbname = "geek";

// Create connection by passing these connection parameters
$conn = new mysqli($servername, $username, $password, $dbname);

//sql query to find average cost of food items in food table
$sql = "SELECT  AVG(cost) FROM food";
$result = $conn->query($sql);
//display data on web page
while($row = mysqli_fetch_array($result)){
    echo "Average items :". $row['AVG(cost)'];
      echo "<br />";
}

//close the connection

$conn->close();
?>
</body>
</html>

Type “localhost/form.php” in the browser.

Output :

Example-2 :
PHP's code to find the average weight of items as follows.

PHP

<html>
<body>
<?php
//servername
$servername = "localhost";
//username
$username = "root";
//empty password
$password = "";
//geek is the database name
$dbname = "geek";

// Create connection by passing these connection parameters
$conn = new mysqli($servername, $username, $password, $dbname);

//sql query to find average weight  of food items in food table
$sql = "SELECT  AVG(weight) FROM food";
$result = $conn->query($sql);
//display data on web page
while($row = mysqli_fetch_array($result)){
    echo "Average items :". $row['AVG(weight)'];
      echo "<br />";
}

//close the connection

$conn->close();
?>
</body>
</html>

Output :

Example-3 :
Code that combines all the average items cost and average item weight.

PHP

<html>
<body>
<?php
//servername
$servername = "localhost";
//username
$username = "root";
//empty password
$password = "";
//geek is the database name
$dbname = "geek";

// Create connection by passing these connection parameters
$conn = new mysqli($servername, $username, $password, $dbname);

//sql query to find average
$sql = "SELECT  AVG(cost),AVG(weight) FROM food";
$result = $conn->query($sql);
//display data on web page
while($row = mysqli_fetch_array($result)){
    echo "Average items cost  :". $row['AVG(cost)'];
    echo "<br />";
    echo "Average items weight  :". $row['AVG(weight)'];
      
}

//close the connection

$conn->close();
?>
</body>
</html>

Output :

PHP | mysqli_fetch_array() Function

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PHP-My SQL avg() aggregate function

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