Re: NULL concatenation

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