Re: [GENERAL] NULL concatenation

Hello Sridhar,

Have you tried the 'coalesce' function to handle the nulls?

Kind Regards,

Adam Pearson

________________________________
From: pgsql-general-owner(at)postgresql(dot)org <pgsql-general-owner(at)postgresql(dot)org> on behalf of Sridhar N Bamandlapally <sridhar(dot)bn1(at)gmail(dot)com>
Sent: 12 May 2016 09:47
To: PG-General Mailing List; PostgreSQL-hackers
Subject: [GENERAL] 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