What’s wrong with my MYSQL Code query in php file?

I have two tables in mysql database

one table named is place:

place_id place active shortform country type
1 Uttar Pradesh 1 UP India State
2 Delhi 1 DELHI India Union territory
3 Punjab 1 PUN India State
4 Karnataka 1 KAR India State
5 Kerala 1 KER India State
6 Lucknow 1 LKO India Capital
7 Chandigarh 1 CHA India Capital
8 Bengaluru 1 BEN India Capital
9 Thiruvanthapuram 1 THI India Capital
10 Saharanpur 1 SAH India District
11 Meerut 1 MEE India District
12 Gorakhpur 1 GOR India District

and other named as place_capital

id_place_place place_parent place_child
1 1 6
2 3 7
3 4 8
4 5 9
5 1 10
6 1 11
7 1 12

I run this query

select *, group_concat(place_capital.place_child) AS Group from place
left join place_capital on place.place_id = place_place.place_parent
where place.place_id = place_place.place_parent and active = :active AND type = :type
group by place ORDER BY place

and it give the following result

place_id place active shortform country type id_place_place place_parent place_child Group
1 Uttar Pradesh 1 UP India State 1 1 6 6,10,11,12
3 Punjab 1 PUN India State 2 3 7 NULL
4 Karnataka 1 KAR India State 3 4 8 NULL
5 Kerala 1 KER India State 4 5 9 NULL

What query I used in php file to give the following result that include Delhi also.
The place table have some relationship with place_place table. with my above sql query that not give the Delhi in the result. So, what is the thing I missed in the php file to get the below result.

place_id place active shortform country type id_place_place place_parent place_child Group
1 Uttar Pradesh 1 UP India State 1 1 6 6,10,11,12
2 Delhi 1 DELHI India Union Territory NULL NULL NULL NULL
3 Punjab 1 PUN India State 2 3 7 NULL
4 Karnataka 1 KAR India State 3 4 8 NULL
5 Kerala 1 KER India State 4 5 9 NULL

and here is the code in the php file:-

public function __construct(Querier $db, $type = "", $active = 1) {
$this->db = $db;
$this->type = $type;
$this->active = $active;

$connection = $this->db->getConnection();

if ($this->type != "") {
    $statement = $connection->prepare("select *, group_concat(place_capital.place_child) AS Group from place
                                    left join place_capital on place.place_id = place_place.place_parent
                                    where place.place_id = place_place.place_parent and active = :active AND type = :type
                                    group by place ORDER BY place ");
    $statement->bindParam(":type", $this->type);
} else {
    $statement = $connection->prepare("SELECT * FROM place WHERE active = :active ORDER BY place ");
}

$statement->bindParam(":active", $this->active);
$statement->execute();
$this->_guide_list = $statement->fetchAll();

}