What are the advantages and disadvantages of using JOINs in PHP for querying and displaying relational data in tables?

When querying and displaying relational data in tables in PHP, using JOINs can be advantageous as it allows you to retrieve data from multiple tables in a single query, reducing the number of queries and improving performance. However, JOINs can also be complex to write and understand, especially for beginners. Additionally, using JOINs can sometimes result in duplicate data being retrieved if not used correctly. 

<?php
// Example of using JOIN to query and display relational data in tables
$query = "SELECT users.name, orders.order_date 
          FROM users 
          JOIN orders ON users.id = orders.user_id";

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

echo "<table>";
echo "<tr><th>Name</th><th>Order Date</th></tr>";
while($row = mysqli_fetch_assoc($result)) {
    echo "<tr><td>".$row['name']."</td><td>".$row['order_date']."</td></tr>";
}
echo "</table>";

mysqli_close($connection);
?>

Keywords

JOINs relational data tables advantages disadvantages

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