Re: [HACKERS] [GENERAL] NULL concatenation

[Sridhar N Bamandlapally]

Hi Adam

we need simple concatenation of all variables(which values may come NULL or
valid-values based on functional process),

coalesce is different functionality

Thanks
Sridhar
OpenText


On Thu, May 12, 2016 at 4:56 PM, Adam Pearson <
adam.pear...@realisticgames.co.uk> wrote:

> Hello Sridhar,
>
>   Have you tried the 'coalesce' function to handle the nulls?
>
>
> Kind Regards,
>
> Adam Pearson
> --
> *From:* pgsql-general-ow...@postgresql.org <
> pgsql-general-ow...@postgresql.org> on behalf of Sridhar N Bamandlapally <
> sridhar@gmail.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:*===> 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
>
>

Re: [HACKERS] [GENERAL] NULL concatenation

[Adam Pearson]

Hello Sridhar,

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


Kind Regards,

Adam Pearson


From: pgsql-general-ow...@postgresql.org  
on behalf of Sridhar N Bamandlapally 
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:===> 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