SQL> create table registrations
2 ( attendee NUMBER(4)
3 , course VARCHAR2(6)
4 , begindate DATE
5 , evaluation NUMBER(1)
6 , constraint R_PK primary key (attendee,course,begindate)
7 ) ;
Table created.
SQL>
SQL> alter table registrations
2 add (entered_by number(4) default 9 not null);
Table altered.
SQL>
SQL> drop table registrations;
Table dropped.