Use null value with IN operator : IN « Query Select « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
2. Query Select
3. IN

SQL>
SQL> create table registrations
  2  ( attendee    NUMBER(4)
  3  , course      VARCHAR2(6)
  4  , begindate   DATE
  5  , evaluation  NUMBER(1)) ;

Table created.

SQL>
SQL>
SQL> insert into registrations values (1, 'SQL',date '1999-04-12',4   );

1 row created.

SQL> insert into registrations values (2, 'SQL',date '1999-12-13',NULL);

1 row created.

SQL> insert into registrations values (3, 'SQL',date '1999-12-13',NULL);

1 row created.

SQL> insert into registrations values (4, 'OAU',date '1999-08-10',4   );

1 row created.

SQL> insert into registrations values (5, 'OAU',date '2000-09-27',5   );

1 row created.

SQL> insert into registrations values (6, 'JAV',date '1999-12-13',2   );

1 row created.

SQL> insert into registrations values (7, 'JAV',date '2000-02-01',4   );

1 row created.

SQL> insert into registrations values (8, 'JAV',date '2001-02-01',5   );

1 row created.

SQL> insert into registrations values (9, 'XML',date '2002-02-03',4   );

1 row created.

SQL> insert into registrations values (10,'XML',date '2003-02-03',5   );

1 row created.

SQL> insert into registrations values (1, 'PLS',date '2004-09-11',NULL);

1 row created.

SQL> insert into registrations values (2, 'PLS',date '2005-09-11',NULL);

1 row created.

SQL> insert into registrations values (3, 'PLS',date '2006-09-11',NULL);

1 row created.

SQL>
SQL>
SQL> select *
  2  from   registrations
  3  where  evaluation not in (1,2,3,NULL);

no rows selected

SQL>
SQL>
SQL> drop table registrations;

Table dropped.

SQL>
SQL>