Concanate two or more rows from result into single result on CI activerecord - codeigniter

Question

I have situation like this, I want to get value from database(this values used comma delimited) from more than one rows based on month and year that I choose, for more detail check this out..
My Schedule.sql :
+---+------------+-------------------------------------+
|ID |Activ_date | Do_skill |
+---+------------+-------------------------------------+
| 1 | 2020-10-01 | Accountant,Medical,Photograph |
| 2 | 2020-11-01 | Medical,Photograph,Doctor,Freelancer|
| 3 | 2020-12-01 | EO,Teach,Scientist |
| 4 | 2021-01-01 | Engineering, Freelancer |
+---+------------+-------------------------------------+
My skillqmount.sql :
+----+------------+------------+-------+
|ID |Date_skill |Skill |Price |
+----+------------+------------+-------+
| 1 | 2020-10-02 | Accountant | $ 5 |
| 2 | 2020-10-03 | Medical | $ 7 |
| 3 | 2020-10-11 | Photograph | $ 5 |
| 4 | 2020-10-12 | Doctor | $ 9 |
| 5 | 2020-10-01 | Freelancer | $ 7 |
| 6 | 2020-10-04 | EO | $ 4 |
| 7 | 2020-10-05 | Teach | $ 4 |
| 8 | 2020-11-02 | Accountant | $ 5 |
| 9 | 2020-11-03 | Medical | $ 7 |
| 10 | 2020-11-11 | Photograph | $ 5 |
| 11 | 2020-11-12 | Doctor | $ 9 |
| 12 | 2020-11-01 | Freelancer | $ 7 |
+----+------------+------------+-------+
In my website I want to make calculation with those two table. So if in my website want to see start from date 2020-10-01 until 2020-11-01 for total amount between those date, I try to show it with this code :
Output example
+----+-----------+-----------+---------+
|No |Date Start |Date End |T.Amount |
+----+-------- --+-----------+---------+
|1 |2020-10-01 |2020-11-01 |$ 45 | <= this amount came from $5+$7+$5+$7+$5+$9+$7
+----+-------- --+-----------+---------+
Note :
Date Start : Input->post("A")
Date End : Input->post("B")
T.Amount : Total Amount based input A and B (on date)
I tried this code to get it :
<?php
$startd = $this->input->post('A');
$endd= $this->input->post('B');
$chck = $this->db->select('Do_skill')
->where('Activ_date >=',$startd)
->where('Activ_date <',$endd)
->get('Schedule')
->row('Do_skill');
$dcek = $this->Check_model->comma_separated_to_array($chck);
$t_amount = $this->db->select_sum('price')
->where('Date_skill >=',$startd)
->where('Date_skill <',$endd)
->where_in('Skill',$dcek)
->get('skillqmount')
->row('price');
echo $t_amount; ?>
Check_model :
public function comma_separated_to_array($chck, $separator = ',')
{
//Explode on comma
$vals = explode($separator, $chck);
$count = count($vals);
$val = array();
//Trim whitespace
for($i=0;$i<=$count-1;$i++) {
$val[] .= $vals[$i];
}
return $val;
}
My problem is the result from $t_amount not $45, I think there's some miss with my code above, please if there any advice, I very appreciate it...Thank you...

Answer 1

Your first query only return 1 row data.
I think you can do something like this for the first query.
$query1 = $this->db->query("SELECT Do_skill FROM schedule WHERE activ_date >= $startd and activ_date < $startd");
$check = $query1->result_array();
$array = [];
foreach($check as $ck){
$dats = explode(',',$ck['Do_skill']);
$counter = count($dats);
for($i=0;$i<$counter;$i++){
array_push($array,$dats[$i]);
}
and you can use the array to do your next query :)

Answer 2

The array $dcek has the values
Accountant,Medical,Photograph
The query from Codeigniter is
SELECT SUM(`price`) AS `price` FROM `skillqmount`
WHERE `Date_skill` >= '2020-10-01' AND
`Date_skill` < '2020-11-01' AND
`Skill` IN('Accountant', 'Medical', 'Photograph')
which returns 17 - this matches the first three entries in your data.
Your first query will only ever give one row, even if the date range would match multiple rows.