Duplication of results from MYSQL query - php

Question

Hi I have a a query that produces what I need, however I am getting duplicate rows on the output and cannot figure out why, every line is appearing twice. Any ideas?
$query = "SELECT * FROM orders LEFT JOIN users ON orders.USER_ID = users.USER_ID
LEFT JOIN items ON items.CHECKOUT_ID = orders.CHECKOUT_ID ORDER BY
date_order DESC LIMIT 0,1000";
$result = mysqli_query($con, $query);
while($row = mysqli_fetch_array($result, MYSQL_ASSOC)){
$order_id = $row["ORDER_ID"];
$date_order = $row["date_order"];
$date_req = $row["delivery"];
$country = $row["country"];
$firstname = $row["name"];
$lastname = $row["surname"];
$email = $row["email"];
$size = $row["size"];
$total_cost = $row["total_cost"];
echo '<tr><td>' . $order_id . ' </td>' .
'<td>' . $date_order . '</td>' .
'<td>' . $date_req . '</td>' .
'<td>' . $country . ' </td>' .
'<td>' . $firstname . ' </td>' .
'<td>' . $lastname . ' </td>' .
'<td>' . $email . ' </td>' .
'<td>' . $size . ' </td>' .
'<td>€' . number_format($total_cost, 2, '.', '') . ' </td>' .
'<td style="text-align:right"><a href="xxxxxxx_Order_Details_Admin.php?id=' . $order_id . '">More Details</td>' .
'<td style="text-align:right"><a href="xxxxxxxx_Order_Details_print.php?id=' . $order_id . '">Print</td>' .
'</tr>';

Answer 1

Your query should be returning one row for every item in the row. Is this what you are expecting? If you are expecting one row per user or one row per order, then you have the wrong query.
From the fields that you are pulling out, I don't think you want the items. Try this query instead:
SELECT *
FROM orders LEFT JOIN
user
ON orders.USER_ID = users.USER_ID
ORDER BY date_order DESC LIMIT 0,1000
If you are still getting duplicates (or duplicate rows when you are expecting one row per item), then you need to look into the underlying tables to see where the duplicates are coming from.

Answer 2

Change your query to:
SELECT DISTINCT o.ORDER _ID, o.date_order, ...
FROM orders o
LEFT JOIN users u
ON o.USER_ID = u.USER_ID
LEFT JOIN items i
ON i.CHECKOUT_ID = o.CHECKOUT_ID
ORDER BY date_order DESC LIMIT 0,1000
Oh, and always specify which columns you want to return. Using * makes it much more difficult to debug.