innerjoin query in drupal 7 - drupal

Question

I am applying this query for below D6 query , not working ..dont know wat wrong i'm doing ....does innerjoin fails in some condition
$result = db_select('px_slides','s')
->join('node','n','s.vid = n.vid')
->fields('s',array('tissue_type','body_site'))
->fields('n',array('sticky','title'))
->condition('n.status','1','=')
->condition('s.cid','126','=')
->execute()->fetchObject();
drupal 6 query i have:
$result = db_query('
SELECT n.nid, n.vid, n.sticky, n.title, n.created, s.cid, s.ref_id, s.viewurl, s.specimen_type, s.tissue_type, s.body_site, s.test_type, s.algorithm, s.result
FROM {px_slides} s INNER JOIN {node} n ON n.vid = s.vid
WHERE n.status = 1 ')->execute();

Answer 1

You need to put your call to ->join() on a separate line altogether, as it doesn't return the query object:
$query = db_select('px_slides','s')
->fields('s',array('tissue_type','body_site'))
->fields('n',array('sticky','title'))
->condition('n.status','1','=')
->condition('s.cid','126','=');
$query->join('node','n','s.vid = n.vid');
$result = $query->execute()->fetchObject();

Answer 2

The join method does not chain like that. You will have to do something like:
$query = db_select('px_slides','s')
->join('node','n','s.vid = n.vid');
$query->fields('s',array('tissue_type','body_site'))
->fields('n',array('sticky','title'))
->condition('n.status','1','=')
->condition('s.cid','126','=');
$result = $query->execute()->fetchObject();
Also you can use the to string magic method to see the query it is going to execute.
$query->__toString();

Answer 3

Try this...
$query = db_select('px_slides', 's');
$query->innerJoin('node,'n','s.vid = n.vid');
$query->fields('s',array('tissue_type','body_site'));
$query->fields('n',array('sticky','title'));
$query->condition('n.status','1');
$query->condition('s.cid','126');
$result= $query->execute()->fetchAll(PDO::FETCH_ASSOC);