What could be causing the "No Database Selected" error in the newsletter script?

The "No Database Selected" error in the newsletter script could be caused by not selecting a database before executing queries. To solve this issue, make sure to include a line of code to select the database before running any queries in the script. 

// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "newsletter";

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

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

// Select the database
$conn->select_db($dbname);

// Run queries here

Keywords

PHP MySQL database connection mysqli_select_db error handling

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