Zendframework Union Issue - php

Question

I have this code running
$sq = $this->_codes->getAdapter()->select()
->from (array('cs' => 'code_statuses'), array('total' => 'count(*)'))
->join (
array ('c' => 'codes'), 'c.code_id = cs.code_id',
array ('human_state' => new Zend_Db_Expr("CASE c.state_id WHEN 3 THEN 'active' WHEN 5 THEN 'suspended' ELSE 'inactive' END"), 'c.*')
)
->group('cs.code_id');
$sqtemp = $this->_codes->getAdapter()->select()
->from (array('cs' => 'code_statuses'), array('total' => 'count(*)'))
->join (
array ('c' => 'codes'), 'c.code_id = cs.code_id',
array ('human_state' => new Zend_Db_Expr("CASE c.state_id WHEN 3 THEN 'active' WHEN 5 THEN 'suspended' ELSE 'inactive' END"), 'c.*')
)
->group('cs.code_id');
if (!empty($options['state_id'])):
if (is_array($options['state_id'])):
$states = 'cs.state_id=' . implode(' OR cs.state_id=', $options['state_id']);
$sq->where($states)
->having(total<=4);
$sqtemp->where ('cs.state_id=5')
->having(total<4);
else:
$sq->where ('cs.state_id=?', $options['state_id']);
endif;
The issue occurs when i try to use union
$sqfinal=$this->_codes->getAdapter()->select()
->union(array($sq,$sqtemp))
->order('cs.code_id');
but individually $sq and $sqtemp work fine
SQLSTATE[42S22]: Column not found: 1054 Unknown column 'cs.code_id' in 'order clause'
Not sure where I am going wrong
Any help will be appreciated
*edit
SELECT count(*) AS `total`,
CASE c.state_id
WHEN 3 THEN 'active'
WHEN 5 THEN 'suspended'
ELSE 'inactive'
END AS `human_state`, `c`.*
FROM `code_statuses` AS `cs`
INNER JOIN `codes` AS `c`
ON c.code_id = cs.code_id
WHERE (cs.state_id=1 OR cs.state_id=2 OR cs.state_id=4)
GROUP BY `cs`.`code_id` HAVING (total<=4)
UNION
SELECT count(*) AS `total`,
CASE c.state_id
WHEN 3 THEN 'active'
WHEN 5 THEN 'suspended'
ELSE 'inactive'
END AS `human_state`, `c`.*
FROM `code_statuses` AS `cs`
INNER JOIN `codes` AS `c`
ON c.code_id = cs.code_id
WHERE (cs.state_id=5)
GROUP BY `cs`.`code_id`
HAVING (total<4)
The part before the union is $sq, the part afterwards is $sqtemp, the combination of the two gives the print out above
Both of them with union in is the whole thing

Answer 1

After a second look at your code, I suspect the oder() call on the union. You're ordering by cs.code_id, whic is not mentioned in any of the select statements, nor is the c.code_id for that matter.
Try adding either c.code_id or cs.code_id to the SELECT't that make up the UNION, possibly consider using an alias, which you can then use in your order clause.
$sq = $this->_codes->getAdapter()->select()
->from(array('cs' => 'code_statuses'),
array(
'total' => 'count(*)'
'cscodeids' => 'code_ids',
));
//...
$union = $this->_codes->getAdapter()
->select()
->union(array($sq,$sqtemp))
->order('cscodeids');
This, I believe, should work. I've taken inspiration from various places. Here are some of the links that lead up to my answer (can't find all of them ATM):
MySQL union and order by help
Every derived table must have its own alias - error from combination descending MySQL
Using union and order by clause in mysql
How to use union in zend db
Zend_Db union issue: old bug report... contains some details