Hello,
You are missing Zend db columns.
http://framework.zend.com/manual/2.1/en/modules/zend.db.sql.html#columns
Something like
$sql = new Sql($this->adapter);
$select = $sql ->select();
$select->from(array('bid_buy'),)
$select->columns(array('maxamount'=> new
Expression('max(bid_amount)')))
->where(array('id' => $id))
->order('id DESC');
Regards,
Chintan Patel
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