php - A Database Error Occurred Error Number: 1064 -

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i've been working on project , wan't trying figure out how make union mysql method in codeigniter 3, can't find problem have, here's model file i've created, can 1 help:

class reference_model extends ci_model { function  search($term,$orig){     //affichage des produits par référence     $this->db->select('*')         ->distinct()         ->from('treference')         ->like('sreference',$term)         ->or_like('nreference', $term)         ->or_like('ssearch', $term)         ->or_like('ssort', $term)         ->get();     $q1 = $this->db->last_query();     if (isset($orig)) {     $this->db->select('nmanufacturer')         ->distinct()         ->from('tmanufacturer')         ->where_in('nmanufacturer=treference.nmanufacturer')         ->get();     $q2 =  $this->db->last_query();     }else {     $q2='';     }      $query = $this->db->query($q1." union ".$q2);     $ret = array();     $ret['rows'] = $query->result();     $ret['number'] = $query->num_rows();      return $ret; } }

and thank help

if trying union of 2 query there requirements names of columns (which being selected) should same..

in case , in 1st query select('*') , in 2nd select('nmanufacturer') , sure, these 2 queries selecting different columns.


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