Query

On Fri, 2006-10-13 at 09:42 -0700, Bob Pawley wrote:

I have a trigger that produces an error "returns more than one row".

My intent is to fill one table (library.specification) from another
(p_id.specification). The p_id table can have multiple instances of
the same fluid but I want the library table to have only one record of
each fluid.

Any insight into what is happening will be appreciated.

Bob Pawley

create or replace function library_spec() returns trigger as $$
begin

Declare
fluid_type varchar ;

Begin
Select fluid into fluid_type
From p_id.specifications
Where fluid = new.fluid ;

Why not just do fluid_type := new.fluid? I don't understand what that
query is supposed to do. You can't fit multiple records into the
fluid_type variable. This might be the source of your error if there are
multiple records with the same fluid_type in p_id.specifications.

If fluid_type <> library.specifications.fluid Then
Insert Into library.specifications (fluid) values (new.fluid_type) ;

Elseif
fluid_type = library.specifications.fluid Then
Do Nothing ;

Why an elseif? I don't understand.

End if ;
return null ;
end ;
end ;
$$ language plpgsql ;

create trigger libspec after insert on p_id.processes
for each row execute procedure library_spec();

Hope this helps.

Regards,
Jeff Davis