How can I count products in category

Question

I have a table with categories in nested set model, I would like to take the categories with how many products they have. something like this

Categories-(6)
    Cars-(4)
      BMW-(2)
      Opel-(1)
      Mercedes-(1)
    Trucks-(2)
      Man-(1)
      Mercedes-(1)

I have two tables, categories and types

Categories: id,name,level,lft,rgt

Types: id,category_id,name

Now I'm able to list only the categories with this:

$categories = Doctrine_Core::getTable('Category')
  ->createQuery('c1')
  ->select('c1.id, c1.level, c1.name')
  ->innerJoin('c1.Category c2 ON ( c1.lft BETWEEN c2.lft AND c2.rgt )')
  ->andWhere(' c2.id = ?', $id)
  ->andWhere('c1.level > 0')
  ->andWhere('c1.level < c2.level+3')
  ->groupBy('c1.id')
  ->orderBy('c1.lft')
  ->execute();

Is there anyway to return the count like that one above?

Answer 1

select table1.name,table2.countcars
from categories as table1 right join 
     (select category_id,count(*) as countcars 
        from cars group by category_id) as table2 
  on table1.id=table2.category_id;

You'll get

    BMW-(2)
    Opel-(1)
    Mercedes-(1)

from above query

for Cars-(4) you'll simply have to do this

select count(*) as numberOfCars from cars;