Question

I have the following query:

SELECT concat(first_name, ' ', last_name) as full_name FROM auth_user

How would I do the equivalent of:

SELECT concat(first_name, ' ', last_name) as full_name FROM auth_user 
    **WHERE full_name IS NOT NULL**

(which produces a Unknown column 'full_name' in 'where clause')

Answer 1

Two ways around this:

SELECT concat(first_name, ' ', last_name) as full_name FROM auth_user 
WHERE first_name IS NOT NULL and last_name is not null

or,

select * from (
    SELECT concat(first_name, ' ', last_name) as full_name FROM auth_user)
where full_name is not null