How can PHP developers optimize their code by avoiding redundant database queries for the same data when working with multiple tables?

Avoid redundant database queries by utilizing JOINs in SQL queries to fetch data from multiple tables in a single query. This reduces the number of queries executed and improves performance by fetching all necessary data in one go. Additionally, consider caching frequently accessed data to further optimize database interactions. 

// Example of using JOIN in SQL query to fetch data from multiple tables
$query = "SELECT users.username, orders.order_id 
          FROM users 
          JOIN orders ON users.user_id = orders.user_id 
          WHERE users.user_id = 1";

$result = mysqli_query($connection, $query);

// Process the result set
while ($row = mysqli_fetch_assoc($result)) {
    echo "Username: " . $row['username'] . ", Order ID: " . $row['order_id'] . "<br>";
}

Keywords

PHP database queries optimization multiple tables redundant data

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