Question

我在获取列的总和时遇到问题。它会像SUM('billing_amount' - billing_philhealth)

我尝试了以下代码但没有解决问题...

<?php
                       $this->db->where('billing_id', $data->billing_id);
                       $this->db->select_sum(('billing_amount') - ('billing_philhealth'));
                       $query3 = $this->db->get('billing_entry');
                       $x = 1;
                            foreach ($query3->result() as $tot)
                            {   
                                echo '<h3>₱'.$tot->billing_amount.'</h3>';
                                echo '<input type="hidden" name="total_amount" id="totAmt" value="'.$tot->billing_amount.'">';
                            } 
                ?>

Answer 1

试试这个

$this->db->select('SUM(field1) + SUM(field2) + SUM(field3) as total', FALSE);

FALSE停止自动转发

Codeigniter：两列的SUM

1 个答案: