Many ELSE statement in Expression in QGIS (2.6)

Question

is it possible to have more than one ELSE in the CASE WHEN statement in the Expression builder in QGIS?

For example:

CASE WHEN "population" > 5000
THEN 'big'
ELIF WHEN "population" > 1500
THEN 'medium'
ELSE 'small'
END

I know that this piece of code is totally wrong, but I'm not able to find an equivalent of ELIF..

Some ideas? Am I looking at the problem in the wrong way?!

Answer 1

Ok guys, I'm sorry..

The equivalent of ELIF is WHEN.

This question has been already answered here.

Sorry for the noise.