Error in Nested SubQuery In DQL: Class '(' is not defined

Question

I have a DQL as like below:

SELECT at, count(at.id) FROM AccountTriple at JOIN at.property p JOIN at.account ac WHERE p.create_analytics = '1' GROUP BY at.property, at.value, ac.service

As you can see, it has three joins. As 'at' and 'ac' both have large amount of data. In attempt to optimize it, I am trying to move the "p.create_analytics = '1'" checking before join to 'ac' to give it a smaller data set to join. I am trying to achieve something like this:

SELECT at, count(at.id) FROM ( SELECT at FROM AccountTriple at JOIN at.property p WHERE p.create_analytics = '1' ) JOIN at.account ac  GROUP BY at.property, at.value, ac.service

But somehow, my syntax isn't working. A error message is showing as below:

Semantical Error] line 0, col 29 near '( SELECT at FROM': Error: Class '(' is not defined.

Didn't find similar example anywhere else as well. Does anyone can help to fix this DQL query to get working? Thanks in advance.

Vesiculate

Answer 1

Use the createSubquery() function to create a subquery in Doctrine. You can then nest the subquery into your main query.

Example

// build root query
$query = Doctrine_Query::create()
  ->from('Movie m')
  ->where('name = ?', 'Prometheus')
;

// build subquery
$subquery = $query->createSubquery()
  ->from('SeenMovie sm')
  ->where('m.name = sm.name')
;

// nest subquery and execute
$query->where('EXISTS (' . $subquery->getDql() . ')')->execute();

Further Reading
A Bulletproof Pattern for Creating Doctrine Subqueries of Any Complexity

Isotone

Very elegant solution. Did not know about it. – Underskirt