Codeigniter retrieve top 5 most occurring rows in column - php

Question

I currently am using codeigniter 3 to build a website. I have been able to build a full gallery and cart system using the database and active record. As well as a backend. I am currently now working the charts.js to build a pie graph in the backend of the 5 top sellers on the site. As well I will be making a graph for items sold by hour using the line graph. I can make the charts appear with dummy data no problem, however I am running into an issue of trying to retrieve the right data from the DB. It appears the query is going to be quite complex.
My mysql table is named order_items. And in order items there is a column qty and a column product_type. Both return integers. What I need is to find which five items have sold the most quantity. Eventually I will need to add the data to my charts.js setup as follows. Anyone with advanced experience with codeigniter active record?
var pieData = [{
value : 300,
color : "#F7464A",
highlight : "#FF5A5E",
label : "Product 1"
}, {
value : 125,
color : "#46BFBD",
highlight : "#5AD3D1",
label : "Product 2"
}, {
value : 100,
color : "#FDB45C",
highlight : "#FFC870",
label : "Product 3"
}, {
value : 40,
color : "#949FB1",
highlight : "#A8B3C5",
label : "Product 4"
}, {
value : 20,
color : "#4D5360",
highlight : "#616774",
label : "Product 5"
}];

Answer 1

I think you should try this script,
$data = $this->db->select('*')
->from('order_items,SUM(qty) as total_qty')
->order_by('total_qty','desc')
->limit(5)
->group_by('product_id')
->get()->result_array();

Answer 2

I found my own solution using php in case some one else stumbles upon this. If there is a better way to do this using mysql I would be glad to learn something. Here is my php function getting the results I need.
$query = $this -> db -> get('order_items');
$array = array();
foreach ($query -> result() as $result) {
$key = $result -> product_id;
$value = $result -> qty;
if (!isset($array[$key])) {
$array[$key] = $value;
} else if (array_key_exists($key, $array)) {
$old = $array[$key];
$array[$key] = $value + $old;
}
}
arsort($array);
$newArray = array_slice($array, 0, 5, true);
return $newArray;
In the last few hours I have done some mysql tutorials and learned a lot about join, order and limit. Below is what I finally used to get what I needed.
$select = array('products.name as label', 'sum(order_items.qty) as value');
$final = $this -> db -> select($select)
-> from('products')
-> join('order_items', 'order_items.product_id = products.id', 'left')
-> group_by('products.id')
-> order_by('value', 'DESC')
-> limit(5)
-> get() -> result_array();

Answer 3

Try This
$data = $this->db->select('id, product_id, SUM(quantity) as total_qty')
->from('table')
->order_by('total_qty','desc')
->limit(5)
->group_by('product_id')
->get()->result_array();

Answer 4

public function getAllBestsaller() {
$result = array();
$returndata = array();
$this->db->select("*, SUM(total_sale) as total_sale");
$this->db->from("{$this->tblproducts}");
$this->db->where('isactive', 1 );
$this->db->order_by('total_sale','desc');
$this->db->limit(2);
$this->db->group_by('product_id');
$aQuery = $this->db->get();
$this->db->last_query();
if($aQuery -> num_rows() >0 ){
$returndata = $aQuery->result();
}
return $returndata;
}