Fetch assoc error - php

Question

Hello
i'm trying to make a table with this query but i cant get it to work. the thing is that it cant select 2 query's at a time but i dont know another way for it..
$active_ids = '1, 3, 4';
$query = "SELECT * FROM users WHERE id IN ({$active_ids})";
$result = $mysqli->query($query);
$query = "SELECT dj, count(*) AS n FROM timetable WHERE dj IN ({$active_ids}) GROUP BY dj";
$result = $mysqli->query($query);
while($row = $result->fetch_assoc()){
echo $row['username'], "<br/>";
echo $row['n'], "<br/>";
}

Answer 1

Try this:
$active_ids = '1, 3, 4';
$result = $mysqli->query("
(SELECT * FROM users WHERE id IN ({$active_ids}))
UNION
(SELECT dj, count(*) AS n FROM timetable WHERE dj IN ({$active_ids}) GROUP BY dj)
") ;
if (!$rec = mysqli_fetch_array($result)) {
echo ("Sorry, no records found");
}
else {
do {
echo ($rec["username"]);
echo "<br />";
echo ($rec["n"]);
echo "<br />";
}
while ($rec = mysqli_fetch_array($result));
}

Answer 2

$active_ids = '1, 3, 4';
$query = "SELECT users.* from users
LEFT JOIN timetable ON users.id=timetable.dj
WHERE users.id IN ({$active_ids})
UNION
SELECT timetable.dj,timetable.count(*) as n from timetable
RIGHT JOIN users ON timetable.dj=users.id
WHERE timetable.dj IN ({$active_ids}) GROUP BY timetable.dj
";
$result = $mysqli->query($query);
while($row = $result->fetch_assoc()){
echo $row['username'], "<br/>";
echo $row['n'], "<br/>";
}
I don't know it is certainly true but can you try this code ?