Not empty(null) : NOT « Query Select « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Query Select » NOT 
2.25.4.Not empty(null)
SQL> create table emp
  2  empno      NUMBER(4)    constraint E_PK primary key
  3  , ename      VARCHAR2(8)
  4  , init       VARCHAR2(5)
  5  , job        VARCHAR2(8)
  6  , mgr        NUMBER(4)
  7  , bdate      DATE
  8  , sal       NUMBER(6,2)
  9  , comm       NUMBER(6,2)
 10  , deptno     NUMBER(2)    default 10
 11  ;

Table created.

SQL> insert into emp values(1,'Tom','N',   'Coder', 13,date '1965-12-17',  800 , NULL,  20);

row created.

SQL> insert into emp values(2,'Jack','JAM', 'Tester',6,date '1961-02-20',  1600300,   30);

row created.

SQL> insert into emp values(3,'Wil','TF' ,  'Tester',6,date '1962-02-22',  1250500,   30);

row created.

SQL> insert into emp values(4,'Jane','JM',  'Designer', 9,date '1967-04-02',  2975, NULL,  20);

row created.

SQL> insert into emp values(5,'Mary','P',  'Tester',6,date '1956-09-28',  12501400,  30);

row created.

SQL> insert into emp values(6,'Black','R',   'Designer', 9,date '1963-11-01',  2850, NULL,  30);

row created.

SQL> insert into emp values(7,'Chris','AB',  'Designer', 9,date '1965-06-09',  2450, NULL,  10);

row created.

SQL> insert into emp values(8,'Smart','SCJ', 'Coder', 4,date '1959-11-26',  3000, NULL,  20);

row created.

SQL> insert into emp values(9,'Peter','CC',   'Designer',NULL,date '1952-11-17',  5000, NULL,  10);

row created.

SQL> insert into emp values(10,'Take','JJ', 'Tester',6,date '1968-09-28',  15000,     30);

row created.

SQL> insert into emp values(11,'Ana','AA',  'Coder', 8,date '1966-12-30',  1100, NULL,  20);

row created.

SQL> insert into emp values(12,'Jane','R',   'Manager',   6,date '1969-12-03',  800 , NULL,  30);

row created.

SQL> insert into emp values(13,'Fake','MG',   'Coder', 4,date '1959-02-13',  3000, NULL,  20);

row created.

SQL> insert into emp values(14,'Mike','TJA','Manager',   7,date '1962-01-23',  1300, NULL,  10);

row created.

SQL>
SQL> select ename, job, sal, comm
  2  from   emp
  3  where  comm is not null;

ENAME    JOB             SAL       COMM
-------- -------- ---------- ----------
Jack     Tester         1600        300
Wil      Tester         1250        500
Mary     Tester         1250       1400
Take     Tester         1500          0

SQL>
SQL>
SQL> drop table emp;

Table dropped.
2.25.NOT
2.25.1.NOT to negate a boolean value
2.25.2.Or, and, not
2.25.3.NOT operator has higher priority than AND
2.25.4.Not empty(null)
2.25.5.Not equals
2.25.6.Not equals: not vs <>
2.25.7.not in (1,2,3,NULL)
2.25.8.not in vs not exists
2.25.9.Not has the lowerest priority
2.25.10.Not(condition1 and condition2)
2.25.11.Using Not in and subquery
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