如何從3個表中獲取數據？函數

Question

我有錯誤怎麼修復？ 「在where子句是不明確的列 '標題'」：

get_results_from($search_term='default') 
    $targets=array('a_table','b_table','c_table'); 
    $this->db->select('*'); 
    $this->db->from($targets); 
    $this->db->like('title',$search_term); 
    $this->db->or_like('body', $search_term); 
    $query = $this->db->get(); 
    return $query->result_array(); 

Answer 1

有

<?php 
get_results_from($search_term='default'); 
$sql = "SELECT * from a_table where `title` LIKE '%".$search_term."%' OR `body` LIKE '%".$search_term."%' 
     UNION 
     SELECT * from b_table where `title` LIKE '%".$search_term."%' OR `body` LIKE '%".$search_term."%' 
     UNION 
     SELECT * from c_table where `title` LIKE '%".$search_term."%' OR `body` LIKE '%".$search_term."%' "; 
$query = $this->db->query($sql); 
return $query->result_array(); 
?> 

Answer 2

一個試試這個代碼：

function get_results_from($search_term='default') 
{ 
    $targets=array('a_table','b_table','c_table'); 
    $this->db->select('*'); 
    $this->db->from($targets); 
    $this->db->group_start(); 
     $this->db->like('a_table.title',$search_term); 
     $this->db->or_like('b_table.title',$search_term); 
     $this->db->or_like('c_table.title',$search_term); 
     $this->db->or_like('body', $search_term); 
    $this->db->group_end(); 
    $query = $this->db->get(); 
    return $query->result_array(); 
}