PHP SQL Concat issue - php

Question

Cheers,
I want to concat multiple rows to one column
Right now, my output is
CaseID Name Number Register date filename Actions
2 John Doe 3/2020 2020-01-20 test1.pdf delete
2 John Doe 3/2020 2020-01-20 test2.pdf delete
3 Jane Doe 5/2020 2020-01-20 test3.pdf delete
I want something like this:
CaseID Name Number Register date filename Actions
2 John Doe 3/2020 2020-01-20 test1.pdf delete
test2.pdf
3 Jane Doe 5/2020 2020-01-20 test3.pdf delete
All-day I have tried different SQL statements, but nothing works.
I'm stuck, I have no idea how to resolve it because I need to use LEFT JOIN for 2 tables:
$sql = "SELECT * FROM files as f
LEFT JOIN cases AS c on f.id_case_f = c.id_case
LEFT JOIN customers as cs on c.id_customer = cs.id_cust
WHERE case_number LIKE '%$case_number%'";
$result = $db -> query($sql);
I have tried with GROUP_CONCAT
I have used the statement below, but it doesn't work.
<?php
$db = mysqli_connect("localhost", "root", "", "testdb");
if ($db -> connect_error){
if($_REQUEST['submit']){
$case_number = $_POST['case_number'];
if(empty($case_number)){
$make = '<h4>You must type a word to search!</h4>';
}else{
$make = '<h4></h4>';
$sql = "SELECT id_case_f, GROUP_CONCAT(filename SEPARATOR ', ') FROM files
LEFT JOIN cases AS c on f.id_case_f = c.id_case
LEFT JOIN customers as cs on c.id_customer = cs.id_cust
WHERE case_number LIKE '%$case_number%'
GROUP BY id_case_f;";
$result = $db -> query($sql);
if($make = mysqli_num_rows($result) > 0)
{ echo '<table>
<tr><th>CaseID</th>
<th>Name </th>
<th>Number </th>
<th>Register date</th>
<th>filename</th>
<th>Actions</th></tr>';
while($row = mysqli_fetch_assoc($result))
{
echo "<tr><td>". $row["id_case"] ." </td><td>". $row["name"] . " </td>
<td>". $row["number"] ."</td> <td> " . $row["register_date"] ." </td>
<td> ". $row["filename"] ." </td><td><a href=#>delete</a></td></tr> ";
}
echo "</table>";
}
else
{
echo'<table "><tr><th>Try again! </th></tr></table>';
print ($make);
}
mysqli_free_result($result);
mysqli_close($db);
}
}
?>
Also, I have used a loooot of other combinations, but unfortunately, nothing worked. :(
If it is necessary I can add the entire PHP code, but this issue is regarding the select statement
Can someone help me with this?
Thank you
LE:
Errors:
Notice: Undefined index: id_case in /// on line 196
Notice: Undefined index: name
Notice: Undefined index: number
Notice: Undefined index: register_date
Notice: Undefined index: filename

Answer 1

SQL GROUP_CONCAT with LEFT JOIN to multiple relative rows
You can try with multiple SELECT statements.
Should work.
Also try to use WHERE EXISTS - https://www.w3schools.com/sql/sql_exists.asp