Order by a SUM with multiple joins in codeigniter - php

Question

Solution:
$query = $this->db->query("
SELECT *, SUM(views.times) AS sum
FROM channel
RIGHT JOIN video
ON channel.channel_id = video.channel_id
LEFT JOIN user
ON channel.user_id = user.user_id
LEFT JOIN views
ON channel.channel_id = views.channel_id
GROUP BY channel.channel_name
ORDER BY sum DESC
");
I have a query that returns a list of items.
function getfrontpage(){
$this->db->select('*');
$this->db->from('channel');
$this->db->join('video', 'channel.channel_id = video.channel_id' , 'right');
$this->db->join('user', 'channel.user_id = user.user_id');
$this->db->group_by("channel.channel_name");
$query = $this->db->get();
return $query->result();
}
Now i'm trying to order these with the SUM from another table, how can i achieve this?
Here is a picture from that table:
I want the results to be sorted by the SUM of the total of "times" for each "channel_id"
thanks in advance

Answer 1

I would suggest to run this through $this->db->query() instead.
It's nice to fetch simple values through CodeIgniters AR functions. But at some situations it's simply easier to build query strings instead.
In your case:
$query = $this->db->query("
SELECT channel_id, SUM(times) AS sum
FROM channel
GROUP BY channel_id
ORDER BY sum DESC
");
You can also escape most values through db->query()!
$this->db->query("
SELECT name
FROM table_name
WHERE id = ?
", array(1));

Answer 2

Isn't it as simple as $this->db->order_by("channel_id", "desc");? this orders the results by channel_id in descending order.

Answer 3

Assuming the table displayed in your question is called times_table, and has a key of user_id, channel_id, you can use the following code to join the times_table into your query so the "times" column is available to sort by.
$this->db->join("times_table", "times.user_id=channel.user_id, times.channel_id=channel.channel_id", "left");
// You've already grouped by channel_name, so grouping by channel_id is probably not necessary.
$this->db->order_by("SUM(times_table.times) DESC");
N.B. I just guessed the name of your displayed table is times_table.