Обсуждение: how to concat/concat_ws all fields without braces

Hello,

I have tried doing something like:

SELECT concat_ws(' ', table.*) FROM table;

and if I do that way, it is essentially same as 

SELECT concat(table.*) FROM table;

and I get the items in braces like (1,something).

Why do I get it in braces?

Is there a way without specifying specific fields
to get all items concatenated without braces?

I would prefer conat_ws option.

Jean

Jean Louis schrieb am 15.06.2019 um 13:19:
> I have tried doing something like:
> 
> SELECT concat_ws(' ', table.*) FROM table;
> 
> and if I do that way, it is essentially same as 
> 
> SELECT concat(table.*) FROM table;
> 
> and I get the items in braces like (1,something).
> 
> Why do I get it in braces?
> 
> Is there a way without specifying specific fields
> to get all items concatenated without braces?
> 
> I would prefer conat_ws option.

you can use the json functions for that:

  select (select string_agg(x.v, ',') from jsonb_each_text(to_jsonb(t)) as x(k,v)) as all_columns
  from the_table t;

Dear Pavel,

Ahoj.

* Pavel Stehule <pavel.stehule@gmail.com> [2019-06-15 11:37]:
> you can write own function that will do what you want
> 
> create or replace function rec_concat_fields(record, text)
> returns text as $$
>   begin
>     return string_agg(value, '|') from json_each_text(row_to_json($1));
>   end
> $$ language plpgsql;
> 
> postgres=# select rec_concat_fields(foo.*, '*') from foo;
> ┌───────────────────┐
> │ rec_concat_fields │
> ╞═══════════════════╡
> │ ahoj|svete        │
> └───────────────────┘
> (1 row)
> 

I have tried that one, not working quite;

create or replace function concat_fields(record, text)
returns text as $$
  begin
    return string_agg(value, ' ') from json_each_text(row_to_json($1));
  end
$$ language plpgsql;
rcdbusiness$# ERROR:  PL/pgSQL functions cannot accept type record

Jean

Dear Thomas,

* Thomas Kellerer <spam_eater@gmx.net> [2019-06-15 11:37]:
> Jean Louis schrieb am 15.06.2019 um 13:19:
> > I have tried doing something like:
> > 
> > SELECT concat_ws(' ', table.*) FROM table;
> > 
> > and if I do that way, it is essentially same as 
> > 
> > SELECT concat(table.*) FROM table;
> > 
> > and I get the items in braces like (1,something).
> > 
> > Why do I get it in braces?
> > 
> > Is there a way without specifying specific fields
> > to get all items concatenated without braces?
> > 
> > I would prefer conat_ws option.
> 
> you can use the json functions for that:
> 
>   select (select string_agg(x.v, ',') from jsonb_each_text(to_jsonb(t)) as x(k,v)) as all_columns
>   from the_table t;

Danke, that works well. I did not know it works
through Jansson exports. I hope it is fast enough.

Jean