What should i do with custom GROUP BY in sql and php? - php

Question

I want to make sub group in group by (SQL).
in my case, I want to make classified detail in group detail which it come from two different column, for more detail, check this out :
I've sql table like this :
+----+-------+--------+-------+
| No | data1 | detail | price |
+----+-------+--------+-------+
| 1 | ID1 | Food | $ 100 |
| 2 | ID1 | Drink | $ 25 |
| 3 | ID2 | Drink | $ 25 |
| 4 | ID1 | Snack | $ 50 |
| 5 | ID2 | Snack | $ 50 |
+----+-------+--------+-------+
I want to make result in my php page like this :
+----+-------+--------+-------+
| No | detail_lunch | price |
+----+-------+--------+-------+
| 1 | Food | |
| | - ID1 | $ 100 |
| 2 | Snack | |
| | - ID1 | $ 25 |
| | - ID2 | $ 25 |
| 3 | Drink | |
| | - ID1 | $ 10 |
| | - ID2 | $ 10 |
+----+-------+--------+-------+
I already tried with GROUP CONCAT as below :
Controller :
$d['data'] = $this->db->query("select detail_item, GROUP_CONCAT (detail) detail_lunch
from table ORDER BY detail_lunch ASC");
Views :
<?php
foreach($data->result_array() as $d)
{
?>
<tr>
<td><?php echo $no; ?></td>
<td><?php echo $d['detail_lunch']; ?></td>
<td><?php echo $d['price']; ?></td>
</tr>
<?php
$no++;
}
?>
My code above not working,
is there any suggestion to solve my problem?
thanks...

Answer 1

GROUP BY is not needed since you're not using an aggregate function (combining two rows of values into a single value), you are attempting to create a pivot table, (joining two columns under a related column as multiple rows). You only need to ORDER BY detail ASC, data1 ASC, iterate over the resultset to display the detail when it changes, otherwise display the data1 and price
Example: https://3v4l.org/7tVDS
Query:
$data = $this->db->query('SELECT data1, detail, price
FROM table ORDER BY detail ASC, data1 ASC');
View:
<?php
//...
$no = 1;
$currentDetail = null;
foreach ($data->result_array() as $d) {
if ($d['detail'] !== $currentDetail) { ?>
<!-- Only Show the Detail when changed -->
<tr>
<td><?php echo $no++; ?></td>
<td><?php echo $d['detail']; ?></td>
<td> </td>
</tr>
<?php } ?>
<!-- Always show the data1/price on subsequent row -->
<tr>
<td> </td>
<td>- <?php echo $d['data1']; ?></td>
<td><?php echo $d['price']; ?></td>
</tr>
<?php
$currentDetail = $d['detail'];
} ?>
Result:
| 1 | Food |
| - ID1 | $ 100 |
| 2 | Drink |
| - ID1 | $ 25 |
| - ID2 | $ 25 |
| 3 | Snack |
| - ID1 | $ 50 |
| - ID2 | $ 50 |
Alternatively you can manipulate how the data is displayed in your view, such as using an unordered list ul in the detail table column td along with price. By using PHP to organize the values how you would like them to be displayed in your view, in an organized associative array.
Example: https://3v4l.org/8sIrR
$dataArray = [];
foreach ($data as $d) {
if (!array_key_exists($d['detail'], $dataArray)) {
$dataArray[$d['detail']] = [];
}
$dataArray[$d['detail']][] = $d;
}
//...
$no = 1;
foreach ($dataArray as $detail => $d) { ?>
<tr>
<td><?php echo $no++; ?></td>
<td>
<?php echo $detail; ?>
<ul>
<?php foreach ($d as $v) { ?>
<li><?php echo $v['data1']; ?> <?php echo $v['price']; ?></li>
<?php } ?>
</ul>
</td>
</tr>
<?php } ?>

Answer 2

Query is the problem .
Select detail_lunch from table group by details.
Then you can use if statement on that result.
I will update my answer after I get to work on my computer.