Re: concat strings but spaces

Matthias Teege wrote:
> I try to concat values from three fields in a function like this:
>
> create or replace function
>  fconcat_name(varchar, varchar, varchar) returns varchar as '
>     declare
>     ttl alias for $1;
>     vnm alias for $2;
>     nme alias for $3;
>     begin
>      return ttl || '' '' || vnm || '' '' || nme;
>     end;
> ' language plpgsql;
>
> That works but if one of the fields is empty there are to much
> spaces in the result. Is there any alternative to a monster
> if-then construct?

Maybe like this:

create or replace function
  fconcat_name(varchar, varchar, varchar) returns varchar as '
      select replace($1 || '' '' || $2 || '' '' || $3, ''  '', '' '')
' language sql;

regression=# select fconcat_name('John','','Doe');
  fconcat_name
--------------
  John Doe
(1 row)

HTH,

Joe