I guess the examples on standard docs explain it.
dont they?
>
> A very simple case would be:
>
> Create table people (
> nif char(12),
> name varchar(40),
> primary (nif)
> );
>
> And now to create a function to return "name" value giving
> "nif" values as a parameter.
you may not need a function at all if your case is that simple . you
can use subselects and || operators to do many complicated things..
can we know a bit more abt. your specific problem
regds
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