Question

I have this select

insert into test(t_name)
(select users.first_name || '_' || users.last_name 
|| '_' || to_date($values.report_date, 'YYYY.MM.DD')
from users where users.id = $session.user_id)

which works as supposed, except I want it if users.first_name/users.last_name are null and user_id=0 to insert another string ‘admin’ otherwise I get error because it violates not-null constraint on column t_name.

Any suggestions are appreciated. Thanks.

Answer 1

Use a CASE in the SELECT part:

insert into test (t_name) 
select case 
         when users.first_name is null and users.last_name is null and users.id=0 then 'admin'
         else users.first_name || '_' || users.last_name || '_' || to_date($values.report_date,'YYYY.MM.DD')
       end 
from users
where users.id = $session.user_id

It’s not clear (to me) from the question if all conditions you mentioned have to be true or just one of them. Depending on what you want, you should change the ANDs to ORs in the first WHEN part.

(Note that there is no need to enclose the SELECT in () for an INSERT ... SELECT statement)