How can one differentiate between using INSERT and UPDATE statements in MySQL queries when updating existing records in PHP?

When updating existing records in MySQL using PHP, it is important to differentiate between using INSERT and UPDATE statements. INSERT is used to add new records to a table, while UPDATE is used to modify existing records. To update existing records, you need to use the UPDATE statement with a WHERE clause to specify which records to update based on certain conditions. 

// Example code to update existing records in MySQL using PHP
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

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

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Update existing record
$sql = "UPDATE table_name SET column1 = 'new_value' WHERE condition_column = 'condition_value'";

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

$conn->close();

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