How can PHP beginners effectively troubleshoot and resolve issues with database queries and data retrieval?

Issue: PHP beginners can effectively troubleshoot and resolve issues with database queries and data retrieval by checking for syntax errors, ensuring proper connection to the database, and using error handling techniques to identify and address any issues that may arise. 

// Example code snippet for troubleshooting database queries
$conn = new mysqli($servername, $username, $password, $dbname);

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

// Sample query to retrieve data from a table
$sql = "SELECT * FROM users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // Output data from each row
    while($row = $result->fetch_assoc()) {
        echo "Name: " . $row["name"]. " - Email: " . $row["email"]. "<br>";
    }
} else {
    echo "0 results";
}

$conn->close();

Keywords

MySQL SQL injection PDO error handling debugging

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