OPER@TL>select select * from test;
AAA        BBB
---------- ----------
         1          1
2          2
3          3
3         10
OPER@TL>create or replace procedure test_p(in_var number,out_var out sys_refcursor)
2  as
3  begin
4  open out_var for select * from test where aaa=in_var;
5  end;
6  /
Procedure created.
OPER@TL>var abc refcursor
OPER@TL>exec test_p(3,:abc)
PL/SQL procedure successfully completed.
OPER@TL>print :abc
AAA        BBB
---------- ----------
         3          3
3         10
OPER@TL>