create table cust_calls
       (
       customer_num            integer,
       call_dtime              datetime year to minute,
       user_id                 char(18) default user,
       call_code               char(1),
       call_descr              char(240),
       res_dtime               datetime year to minute,
       res_descr               char(240),
       primary key (customer_num, call_dtime),
       foreign key (customer_num) references customer (customer_num),
       foreign key (call_code) references call_type (call_code)
        );