Question

When trying to perform relational division using Doctrine 1.2, I receive a “Duplicate alias” error over what seems like the DISTINCT found in the query below:

SELECT 
    Data.ID  
FROM 
    Data 
INNER JOIN 
    TaggedData ON (Data.id = TaggedData.data_id) 
INNER JOIN 
    Tag ON (Tag.id = TaggedData.tag_id) 
WHERE 
    Tag.id IN ('1' , '2') 
HAVING COUNT(DISTINCT tag.iD)=2

If I remove DISTINCT from the query, it runs but doesn’t get me what I want. Is there a proper way to get Doctrine past this issue?

Specific code:

    $query = $this->createQuery("p")
        ->select("p.*")
        ->innerJoin("p.Data s")
        ->innerJoin("s.Tags c")
    ;
    $query
        ->andWhereIn("c.id", $tags)
        ->addHaving("COUNT(DISTINCT c.id) = ?", count($tags))
    ;

Answer 1

Since you are returning only a single value, just execute the raw SQL:

    $sql = <<<SQL

SELECT 
    Data.ID  
FROM 
    Data 
INNER JOIN 
    TaggedData ON (Data.id = TaggedData.data_id) 
INNER JOIN 
    Tag ON (Tag.id = TaggedData.tag_id) 
WHERE 
    Tag.id IN ('1' , '2') 
HAVING COUNT(DISTINCT tag.iD)=2

SQL;

    $conn = Doctrine_Manager::getInstance()->getConnection('connection_name');
    $id = $conn->fetchOne($sql);