How can JOIN queries be leveraged in PHP to improve database query efficiency and result handling?

JOIN queries can be leveraged in PHP to improve database query efficiency by combining data from multiple tables into a single result set. This can reduce the number of queries needed to fetch related data and improve performance. Additionally, JOIN queries can simplify result handling by returning a single dataset that includes all the necessary information. 

<?php
// Connect to the database
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Perform a JOIN query to fetch data from two tables
$query = "SELECT users.username, orders.order_id FROM users
          JOIN orders ON users.user_id = orders.user_id";
$stmt = $pdo->prepare($query);
$stmt->execute();

// Fetch and display the results
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
    echo "Username: " . $row['username'] . " | Order ID: " . $row['order_id'] . "<br>";
}
?>

Keywords

JOIN queries PHP database query efficiency result handling SQL_JOIN

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