関連ワード:  sys_refcursor oracle example    sys ref cursor in oracle example    procedure with sys_refcursor oracle example    sys_refcursor in oracle function example    oracle sys_refcursor loop example    oracle pl sql sys_refcursor example    oracle function return sys_refcursor example    oracle stored procedure sys_refcursor example    out sys_refcursor oracle example    what is sys_refcursor in oracle