Re: Creating a boolean function

> You need conditional logic, which suggests pl/pgsql is the way to go.

Maybe he could use simple sql function like this:

create function check_loan(text,int,int) returns boolean as '
select (         select count(*) from kolcsonok where            code_user=($2) and code_loan=($3) and typetable=($1)
   ) > 0;
 
' language 'sql';

The immediate benefit of it is that there's no need to install
a procedural languge for this simple task.

Regards,
Baldvin