How can utilizing JOIN in SQL queries improve the performance of fetching data from multiple tables in PHP applications?

Utilizing JOIN in SQL queries can improve the performance of fetching data from multiple tables in PHP applications by allowing for the retrieval of related data in a single query, rather than making multiple separate queries. This reduces the number of round trips to the database, resulting in faster data retrieval and improved overall performance. 

<?php
// Establish a connection to the database
$connection = new mysqli("localhost", "username", "password", "database");

// Fetch data from multiple tables using a JOIN query
$query = "SELECT users.username, orders.order_id FROM users 
          JOIN orders ON users.user_id = orders.user_id";
$result = $connection->query($query);

// Process the fetched data
if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        echo "Username: " . $row["username"] . " - Order ID: " . $row["order_id"] . "<br>";
    }
} else {
    echo "No results found.";
}

// Close the database connection
$connection->close();
?>

Keywords

JOIN SQL queries performance fetching data multiple tables

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