How can I order by NULL in DQL?

Question

I\'m building an app using Symfony2 framework and using Doctrine ORM. I have a table with airlines for which some IATA codes are missing. I\'m outputting a list, ordered by

Answer 1

If you want to do something similar to "NULLS LAST" in SQL (with PostgreSQL in my case):

ORDER BY freq DESC NULLS LAST

You can use the COALESCE function with the Doctrine Query Builder (HIDDEN will hide the field "freq" on your query result set).

$qb = $this->createQueryBuilder('d')
           ->addSelect('COALESCE(d.freq, 0) AS HIDDEN freq')
           ->orderBy('freq', 'DESC')
           ->setMaxResults(20);