[HACKERS] NULL concatenation

[Sridhar N Bamandlapally]

Hi

In migration, am facing issue with NULL concatenation in plpgsql,
by concatenating NULL between any where/position to Text / Varchar, the
total string result is setting value to NULL


*In Oracle:*

declare
    txt1 VARCHAR2(100) := 'ABCD';
    txt2 VARCHAR2(100) := NULL;
    txt3 VARCHAR2(100) := 'EFGH';
    txt VARCHAR2(100) := NULL;
begin
  txt:= txt1 || txt2 || txt3;
  dbms_output.put_line (txt);
end;
/

abcdefgh   *===>return value*



*In Postgres*

do $$
declare
    txt1 text := 'ABCD';
    txt2 text := NULL;
    txt3 text := 'EFGH';
    txt text := NULL;
begin
    txt:= txt1 || txt2 || txt3;
    raise notice '%', txt;
end$$ language plpgsql;

NOTICE:  <NULL>  *===> return value*


SQL-Server also does same like Oracle

Is there any way alternate we have for same behavior in PostgreSQL

Please

Thanks
Sridhar
OpenText