create table t ( key number(5) , c1 varchar2(6) , c2 varchar2(10) , c3 date , c4 number ); insert into t values ( 1, 'X', 'AAA' , date '2005-04-03', 3000 ); insert into t values ( 2, 'Y', 'BB' , date '2006-05-04', 2000 ); insert into t values ( 3, 'Y', 'CCCC' , date '2007-06-05', 4000 ); insert into t values ( 4, 'Y', null , date '2008-07-06', 0 ); insert into t values ( 5, 'Y', 'DDDDD', null , 5000 ); insert into t values ( 6, 'Y', null , null , null ); commit;
