In the context of PHP development, how can efficient and streamlined organization of data retrieval and display be achieved when grouping query results by specific criteria?

When grouping query results by specific criteria in PHP, one efficient way to organize data retrieval and display is by using the `GROUP BY` clause in your SQL query. This allows you to group rows that have the same values in specified columns. Additionally, you can use PHP to iterate over the grouped results and display them in a structured format.

// SQL query to retrieve data grouped by specific criteria
$sql = "SELECT column1, column2, COUNT(*) as count FROM table_name GROUP BY column1";

// Execute the query
$result = mysqli_query($conn, $sql);

// Iterate over the grouped results and display them
while ($row = mysqli_fetch_assoc($result)) {
    echo "Column 1: " . $row['column1'] . " | Column 2: " . $row['column2'] . " | Count: " . $row['count'] . "<br>";
}