How to get sum value in mysql table column using Codeigniter

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Codeigniter provides select_sum method to get sum value in mysql table column. Writes a “SELECT SUM(field)” portion for your query. As with select_max(), You can optionally include a second parameter to rename the resulting field.

Let’s create a select_sum method in codeigniter

$this->db->select_sum('amount');
$result = $this->db->get('tbl_product')->row();  
return $result->amount;