How to order_by from specific data - mysql

Question

I have a database like this
order_id | date | qty
------------------------------------
a |2018-11-11 10:03:33 |1
b |2018-11-12 10:03:33 |1
c |2018-11-11 12:03:33 |1
and I have a model like this,
public function get_total_sales_per_day($date_from, $date_to)
{
$this->db->select('order_id, SUM(qty) as total, date');
$this->db->from("order");
$this->db->group_by('date');
$this->db->order_by('date','asc');
$query = $this->db->get();
log_message("debug", $this->db->last_query());
return $query->result();
}
how to use group_by date but only from the year, month and day?

Answer 1

If you want to group by date only like (y-m-d), not apply group by on time
then some change in your code like:
Some modification in your code
public function get_total_sales_per_day($date_from, $date_to)
{
$this->db->select('order_id, SUM(qty) as total, date');
$this->db->from("order");
$this->db->group_by(DATE_FORMAT('date', "%y-%y-%d"));
$this->db->order_by('date','asc');
$query = $this->db->get();
log_message("debug", $this->db->last_query());
return $query->result();
}

Answer 2

You just need to escape while using DATE() function
/*You have not used arguments (date_from, date_to)
anywhere in active record, decide whether you need that,
*/
public function get_total_sales_per_day($date_from, $date_to)
{
$this->db->select('order_id, SUM(qty) as total, date');
$this->db->from("order");
/* This is what you need, $escape = FALSE */
$this->db->group_by('DATE(`date`)',FALSE);
/* If field exists in select then
you can also use : $this->db->order_by('3','asc',FALSE);
meaning sort by 3rd field
OR like below more readable
*/
$this->db->order_by('DATE(`date`)','asc',FALSE);
/* if you wish to order by datetime then you may keep
$this->db->order_by('date','asc');
*/
$query = $this->db->get();
log_message("debug", $this->db->last_query());
return $query->result();
}
You may read source code here :
public function group_by($by, $escape = NULL)
public function order_by($orderby, $direction = '', $escape = NULL)