How to insert content of multiple columns into a new column in sql?

Question

I want to combine the content of two columns and insert it into a new column.

But it does not work. Example:

create table car(
   id bigint NOT NULL,
   manufacture character varying(255),
   number character varying(255),
   result character varying(255)
)

insert into car (result)
select concat(manufacture, ' ', number) from car

Result:

ERROR:  NULL-Value in column „id“ error Not-Null-Constraint
DETAIL:  Failed line contains (null, null, null, bmw 123).

How can I just update the specific row, and leave all other values as it is?

Answer 1

update car set result = concat(manufacture, ' ', number)