Get Similar rows count in mysql - php

Question

I am working on a project in which a tutor can save its class timing. He can see his timing according to the days. I used the code
$qry = mysqli_query($con, 'select * from users left join time_slot on users.id=time_slot.u_id where users.id=' . $id);
echo '<table class="table_class" border="2">
<tr>
<th class="details">id</th>
<th class="details">Date</th>
<th class="details">start time</th>
<th class="details">End Time</th>
</tr>';
while ($row = mysqli_fetch_array($qry)) {
echo '<tr>';
echo '<td class="details">' . $row['id'] . '</td>';
echo '<td class="details">' . $row['name'] . '</td>';
echo '<td class="details">' . $row['day'] . '</td>';
echo '<td class="details">' . $row['time_from'] . '</td>';
echo '<td class="details">' . $row['time_to'] . '</td>';
echo '</tr>';
}
echo '</table>';
But It show the multiple time if a tutor have multiple class in same day.
I want to show if he has 2 or more class on similar day(Monday) then all time slot show in a single row. Same this for all days of the week. How can I do it?

Answer 1

You can use GROUP_CONCAT function for this. Assuming your ddl is something like that
create table users(id bigint, name varchar(50));
create table time_slot(id bigint, u_id bigint, day datetime, time_from time, time_to time);
the sql would be as follows:
select u.id,u.name, ts.day,
group_concat(ts.time_from, ' - ', ts.time_to ORDER BY ts.time_from, ts.time_to)
from users u left outer join time_slot ts on u.id = ts.u_id
group by u.id, u.name, ts.day
order by u.name, ts.day
See fiddle.

Answer 2

I have did with some temp values.
if you want in same way to impliment then it is usefull for you.
copy the code and check here http://phpfiddle.org/
$obj1['id']='1';
$obj1['name']='a1';
$obj1['day']='asdadh';
$obj1['time_from']='1';
$obj1['time_to']='1';
$obj2['id']='2';
$obj2['name']='a2';
$obj2['day']='asdad';
$obj2['time_from']='1';
$obj2['time_to']='1';
$obj3['id']='3';
$obj3['name']='a2';
$obj3['day']='asdad';
$obj3['time_from']='1';
$obj3['time_to']='1';
$arr = Array();
$arr[]=$obj1;
$arr[]=$obj2;
$arr[]=$obj3;
echo '<table class="table_class" border="2">';
echo '<tr>';
echo '<th class="details">id</th>';
echo '<th class="details">name</th>';
echo '<th class="details">day</th>';
echo '<th class="details">start time</th>';
echo '<th class="details">End Time</th>';
echo '</tr>';
foreach($arr as $row)
{
echo '<tr>';
echo '<td class="details">' . $row['id'] . '</td>';
echo '<td class="details">' . $row['name'] . '</td>';
echo '<td class="details">' . $row['day'] . '</td>';
echo '<td class="details">' . $row['time_from'] . '</td>';
echo '<td class="details">' . $row['time_to'] . '</td>';
echo '</tr>';
}
echo '</table>';
echo "<br><br><br><br><br><br><br>";
$dates=Array();
$count=0;
foreach($arr as $id=>$row){
$val = $row['day'];
$key = array_search($val,$dates);
if(is_numeric($key)){
$arr[$key]['day']=$dates[$key].','.$val;
unset($arr[$id]);
}else{
$dates[$count]=$val;
}
$count++;
}
// new table
echo '<table class="table_class" border="2">';
echo '<tr>';
echo '<th class="details">id</th>';
echo '<th class="details">name</th>';
echo '<th class="details">day</th>';
echo '<th class="details">start time</th>';
echo '<th class="details">End Time</th>';
echo '</tr>';
foreach($arr as $row)
{
echo '<tr>';
echo '<td class="details">' . $row['id'] . '</td>';
echo '<td class="details">' . $row['name'] . '</td>';
echo '<td class="details">' . $row['day'] . '</td>';
echo '<td class="details">' . $row['time_from'] . '</td>';
echo '<td class="details">' . $row['time_to'] . '</td>';
echo '</tr>';
}
echo '</table>';