PHP Update Data in MySQL

The UPDATE statement is used to update existing records in a table:

UPDATE table_name
SET column1=value, column2=value2,...
WHERE some_column=some_value 

look at the "Student" table:

ID                    name                   lastname                  rollno                admsn_date

1                     Ankit                    Bhardwaj                    59                    6/9/2016

2                     Rahul                    Paswan                      35                    4/9/2016  

The following examples update the record with id=2 in the "Student" table:

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "data";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 

$sql = "UPDATE Student SET lastname='Rajput' WHERE id=2";

if ($conn->query($sql) === TRUE) {
    echo "Record updated successfully";
} else {
    echo "Error updating record: " . $conn->error;
}

$conn->close();
?>

After the record is updated, the table will look like this:

ID                   name                    lastname                   rollno                  admsn_date

1                    Ankit                    Bhardwaj                    58                        6/9/2016

2                    Rahul                    Rajput                        35                        4/9/2016