Writing a subquery using Zend DB

Question

I am having some problems turning the SQL below into a Zend Db query.

$select = \' SELECT s.id, i.id as instance_id, i.reference, i.name, i.sic_code, i.start         


        

Answer 1

I had a very similar problem and I found that this query can be easily written as follows:

$select = $db->select()
  ->from (
    array("s" => "sles"), 
    array(
      "s.id",
      "instanceid" => "i.id",
      "i.reference",
      "i.name",
      "i.sic_code",
      "i.start_date")
  )
  ->join(
    array('i' => "sle_instances"),
    "s.id = i.sle_id",
    array()
  )
  ->where ("i.id = (" . 
    $db->select()
    ->from('sle_instances', array(new Zend_Db_Expr('max(id)')))
    ->where('sle_id = s.id');
  .")")
  ->order('i.name asc');
print($select);

It is exactly the same as people has already stated here. But I felt it is a little easier to read since the sub-query dependencies are more evident.