Postgres NOT IN (null) gives no result

Question

I\'m using Postgres with this query

select 
*
from Entity this_ 
where 
(this_.ID not in (null))

Why does this give me no results? I would expe

Answer 1

The result of [not] in (null) will always be null. To compare to null you need is [not] null or is [not] distinct from null

select *
from Entity this_ 
where this_.ID is not null

If you want where (ID not in (1,null)) as in your comment you can do

where ID is not null and ID not in (1)