How can the issue of data duplication be addressed when working with multiple entries in a database query result in PHP?

Issue: Data duplication can be addressed by using the DISTINCT keyword in the SQL query to ensure that only unique entries are returned in the result set. PHP Code Snippet: 

<?php
// Connect to 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);
}

// SQL query with DISTINCT keyword to avoid data duplication
$sql = "SELECT DISTINCT column_name FROM table_name";

$result = $conn->query($sql);

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

$conn->close();
?>

Keywords

data duplication database query PHP unique constraint DISTINCT clause

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