Postgres 12

By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0.

select version();


version


PostgreSQL 12.7 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.4.1 20200928 (Red Hat 8.4.1-1), 64-bit


create table tbl(val integer);
insert into tbl(val) values (1),(2),(3);
3 rows affected

with tgt_list (tval) as
     (select unnest(string_to_array('1,2,4,5', ','))::integer)
select tval 
  from tgt_list 
 where not exists 
       (select null 
          from tbl 
         where tval = tbl.val
       ) ;


tval


4

5