Return data from function - Mailing list pgsql-admin

Hello,

I need to create a function that find data over 3 tables, merge and
return data.
With example can be specified more clearly:

1.1 Find all addresses code;
1.2 For each addresses code, get address, complement and city on the
first table;
1.3 For each addresses code, get address, complement and city on the
second table;
1.4 Merge result from first and second tables and return to the function;

I would like to do not using cursor.
Do you have any ideas how to implement?

Thanks in advance.