How can I join a subquery using Zend_Db_Select

Question

How would I construct this query using Zend_Db_Select?:

SELECT users.user_id, email_address, t1.value as \'languages\'    
FROM users
LEFT JOIN (
           


        

Answer 1

$user_multivalued = $db
    ->select()
    ->from('user_multivalued', array(
        'user_id',
        'field_id',
        new Zend_Db_Expr("GROUP_CONCAT(value SEPARATOR ',') AS value")
    ))
    ->where('field = ?', 25)
    ->group('user_id')
    ->group('field_id')
;

$select = $db
    ->select()
    ->from('users', array('user_id', 'email_address'))
    ->joinLeft(
        array('t1' => $user_multivalued),
        't1.user_id = users.user_id',
        array('languages'=>'value')
    )
    ->where('list_id = ?', 45)
;