What are the potential performance issues when retrieving data from multiple tables in PHP?

When retrieving data from multiple tables in PHP, potential performance issues can arise due to the need for multiple database queries and joins, which can slow down the execution time. One way to solve this issue is to use SQL JOINs to combine the data from multiple tables into a single result set, reducing the number of queries needed to fetch the data. 

<?php

// Establish a database connection
$connection = new mysqli('localhost', 'username', 'password', 'database');

// Retrieve data from multiple tables using SQL JOIN
$query = "SELECT t1.column1, t2.column2 FROM table1 t1 JOIN table2 t2 ON t1.id = t2.table1_id";
$result = $connection->query($query);

// Process the result set
if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        // Process each row of data
    }
}

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

?>

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