SQL> create table history
2 ( empno NUMBER(4)
3 , beginyear NUMBER(4)
4 , begindate DATE
5 , enddate DATE
6 , deptno NUMBER(2)
7 , sal NUMBER(6,2)
8 , comments VARCHAR2(60)
9 , constraint H_PK primary key
10 (empno,begindate)
11 , constraint H_BEG_END check
12 (begindate < enddate)
13 ) ;
Table created.
SQL>
SQL>
SQL> alter session set NLS_DATE_FORMAT='DD-MM-YYYY';
Session altered.
SQL>
SQL> insert into history values (1,2000,'01-01-2000','01-02-2000',40, 950,'');
1 row created.
SQL> insert into history values (1,2000,'01-02-2000', NULL ,20, 800,'restarted');
1 row created.
SQL>
SQL> insert into history values (2,1988,'01-06-1988','01-07-1989',30,1000,'');
1 row created.
SQL> insert into history values (2,1989,'01-07-1989','01-12-1993',30,1300,'');
1 row created.
SQL> insert into history values (2,1993,'01-12-1993','01-10-1995',30,1500,'');
1 row created.
SQL> insert into history values (2,1995,'01-10-1995','01-11-2009',30,1700,'');
1 row created.
SQL> insert into history values (2,2009,'01-11-2009', NULL ,30,1600,'just hired');
1 row created.
SQL>
SQL>
SQL> select empno, begindate, comments
2 from history
3 where comments like '%0\%%' escape '\';
no rows selected
SQL>
SQL> drop table history;
Table dropped.
SQL>