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How to write SQL query with PHP to calculate the sum of sales?

 There are the following steps to create a php project to calculate the sum of sales. 

  

Code of index. php:


<?php


// Database connection


$servername = "localhost";

$username = "root";

$password = "";

$dbname = "marks_sheet";


try{

// Create a connection

$conn = new PDO("mysql:host=$servername;dbname=$dbname",$username,$password);

$conn->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);

}catch(PDOException $e){

  echo "Error in connection:".$e->getMessage();

}


// Write the SQL Query to calculate the sum

$sql = "SELECT SUM(amount) AS total_amount FROM sales";

//Execute the query

$stmt = $conn->prepare($sql);

$stmt->execute();

//Fetch the result

$result = $stmt->fetch(PDO::FETCH_ASSOC);?>


<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<meta name="viewport" content="width=device-width, initial-scale=1">

<style type="text/css">

*{

margin:0;

padding:0px;

box-sizing: border-box;

font-family: sans-serif;

}


.container{

display: flex;

width:100%;

height:100vh;

background: whitesmoke;

justify-content: center;

align-items: center;

}

.total{

width:250px;

height:250px;

border-radius:50%;

background:red;

color:white;

font-weight: bold;

justify-content: center;

align-items: center;

line-height:250px;

border:10px solid yellow;

}

</style>

<title>Sales</title>

</head>

<body>

<div class="container">

<div class="total">

<?php

echo "Total Sales Amount:".$result['total_amount'];?>

</div>


</div>


</body>

</html>



<?php

// Close the connection

$conn = null;








?>


Database structure:

Database Name:marks_sheet

Table Name:sales


Final Result:


Download source code:

Download

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