removing same fetched data php - php

Question

<?php
$con = mysqli_connect("localhost","root","","final_osa");
$s_stud = $con->query("SELECT * FROM violations_tbl GROUP BY violation_type");
while($data = $s_stud->fetch_assoc() ){
$bilang = $con->query("SELECT COUNT(*) FROM violations_tbl WHERE `violation_type` ='".$data['violation_type']."' ");
$result = $bilang->fetch_assoc();
if($result['COUNT(*)'] > 1 ){
echo "<tr>";
echo "<td>";
$query=$con->query("SELECT `violation_type` FROM `violations_tbl` WHERE `violation_type`='".$data['violation_type']."'");
while($row=$query->fetch_assoc() ){
echo $row['violation_type'].", ";
}
echo "</td>";
echo "</tr>";
}
}
?>
How can i eliminate same fetched data and echo only one? thanks
here is the one that it echoes. it should be that it will echo only one because its the same
What i'm trying to do here is get the mos violated rule in school thanks

Answer 1

If you want all the violations in order of most violated to least violated
$s_stud = $con->query("SELECT violation_type, count(violation_type) as num_violations
FROM violations_tbl
GROUP BY violation_type
ORDER BY num_violations DESC");
while($row= $s_stud->fetch_assoc() ){
//echo the violation and the count
if($row['num_violations'] > 1 ){
echo "<tr>";
echo "<td>$row[violation_type]</td>";
echo "<td>$row[num_violations]</td>";
echo "</tr>";
}
}
If you only want the MOST violated you could add a LIMIT 1 to the query and remove the looping.
$s_stud = $con->query("SELECT violation_type, count(violation_type) as num_violations
FROM violations_tbl
GROUP BY violation_type
ORDER BY num_violations DESC
LIMIT 1");
$row= $s_stud->fetch_assoc();
//echo the violation and the count
echo "<tr>";
echo "<td>$row[violation_type]</td>";
echo "<td>$row[num_violations]</td>";
echo "</td></tr>";