What are some best practices for avoiding duplicate entries when printing data from a database in PHP?

To avoid duplicate entries when printing data from a database in PHP, you can utilize the DISTINCT keyword in your SQL query to retrieve only unique records. Additionally, you can use the GROUP BY clause to group identical records together and then display them accordingly in your PHP code. 

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

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

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

// Retrieve unique records from the database
$sql = "SELECT DISTINCT column_name FROM table_name";
$result = $conn->query($sql);

// Display the unique records
if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "Column Value: " . $row["column_name"] . "<br>";
    }
} else {
    echo "0 results";
}

// Close the connection
$conn->close();

Keywords

SQL DISTINCT PHP array_unique database

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