drupal sql conditional clauses for multiple tables?

Question

I have the below query for FAQ search module modified that works in Drupal 7, which searches in two tables: 1) title 2) body but don\'t manage to include one more.

Answer 1

$or = db_or()
  ->condition('fd.field_detailed_question_value', '%'.db_like($term ).'%', 'LIKE')
  ->condition('fb.body_value','%'.db_like($term ).'%' , 'LIKE');

$results = db_select('node', 'n')
  ->fields('n', array('nid', 'title'))
  ->leftJoin('field_data_body' , 'fb', 'fb.entity_id=n.nid')
  ->leftJoin('field_data_field_detailed_question' ,'fd', 'fd.entity_id=n.nid')
  ->condition($or)
  ->execute()
  ->fetchAll();

var_dump($results);

db_select documentation

db_or documentation