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

You can use the following trick in DQL to order NULL values last

$em->createQuery("SELECT c, -c.weight AS HIDDEN inverseWeight FROM Entity\Car c ORDER BY inverseWeight DESC");

The HIDDEN keyword (available since Doctrine 2.2) will result in omitting the inverseWeight field from the result set and thus preventing undesirable mixed results.

(The sort fields value is inverted therefore the order has to be inverted too, that's why the query uses DESC order, not ASC.)

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