Query to get top 5 users by total month sales amount - php

Question

I was hoping you could help me figure this out. I would like to run a query that would search a table and all it's rows and the date matches the current month. Then return the user_id. What I am trying to achieve is gathering the top 5 user id's under this query.
How can I change this to find the top 5 for the current month? I am usually able to figure out my queries but this one has me stumped.
This is all I have at the moment.
$top = mysqli_query($mysqli, "SELECT sum(amount) AS total FROM sales WHERE status = 'S' AND MONTH(date) = 1");
while($row = mysqli_fetch_row($top))
{
$userid = $row['0'];
}
Update:
$top = mysqli_query($mysqli, "SELECT user_id
FROM
(
SELECT user_id, SUM(amount) total
FROM sales
WHERE status = 'S'
AND MONTH(date) = MONTH(CURDATE())
AND YEAR(date) = YEAR(CURDATE())
GROUP BY user_id
) q
ORDER BY total DESC
LIMIT 5");
while($row = mysqli_fetch_row($top))
{
$topsales[] = $row['0'];
}
foreach($topsales as $topsale) {
echo $topsale;
}

Answer 1

Are you looking for a query like this?
SELECT user_id
FROM
(
SELECT user_id, SUM(amount) total
FROM sales
WHERE status = 'S'
AND MONTH(date) = MONTH(CURDATE())
AND YEAR(date) = YEAR(CURDATE())
GROUP BY user_id
) q
ORDER BY total DESC
LIMIT 5
or just
SELECT user_id
FROM sales
WHERE status = 'S'
AND MONTH(date) = MONTH(CURDATE())
AND YEAR(date) = YEAR(CURDATE())
GROUP BY user_id
ORDER BY SUM(amount) DESC
LIMIT 5
Here is SLQFiddle demo
Note: using MONTH() and YEAR() functions will prevent MySql from using any index you might have on date column
Now your php code might look like this
$db = new mysqli('localhost', 'user', 'password', 'dbname');
if ($db->connect_errno) {
die('Cannot connect'); // TODO: better error handling
}
$sql = "SELECT user_id
FROM sales
WHERE status = 'S'
AND MONTH(date) = MONTH(CURDATE())
AND YEAR(date) = YEAR(CURDATE())
GROUP BY user_id
ORDER BY SUM(amount) DESC
LIMIT 5";
$topsales = array();
if ($query = $db->prepare($sql)) {
$query->execute();
$query->bind_result($user_id);
while ($query->fetch()) {
$topsales[] = $user_id;
}
$query->close();
} else {
die('Unable to prepare: ' . $db->error); // TODO: better error handling
}
$db->close();
foreach ($topsales as $topsale) {
echo $topsale . '<br>';
}