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SQL>
SQL>
SQL> create table employees(
  2    empno      NUMBER(4)
  3  , ename      VARCHAR2(8)
  4  , init       VARCHAR2(5)
  5  , job        VARCHAR2(8)
  6  , mgr        NUMBER(4)
  7  , bdate      DATE
  8  , msal       NUMBER(6,2)
  9  , comm       NUMBER(6,2)
 10  , deptno     NUMBER(2) ) ;

Table created.

SQL>
SQL>
SQL> insert into employees values(1,'Jason',  'N',  'TRAINER', 2,   date '1965-12-18',  800 , NULL,  10);

1 row created.

SQL> insert into employees values(2,'Jerry',  'J',  'SALESREP',3,   date '1966-11-19',  1600, 300,   10);

1 row created.

SQL> insert into employees values(3,'Jord',   'T' , 'SALESREP',4,   date '1967-10-21',  1700, 500,   20);

1 row created.

SQL> insert into employees values(4,'Mary',   'J',  'MANAGER', 5,   date '1968-09-22',  1800, NULL,  20);

1 row created.

SQL> insert into employees values(5,'Joe',    'P',  'SALESREP',6,   date '1969-08-23',  1900, 1400,  30);

1 row created.

SQL> insert into employees values(6,'Black',  'R',  'MANAGER', 7,   date '1970-07-24',  2000, NULL,  30);

1 row created.

SQL> insert into employees values(7,'Red',    'A',  'MANAGER', 8,   date '1971-06-25',  2100, NULL,  40);

1 row created.

SQL> insert into employees values(8,'White',  'S',  'TRAINER', 9,   date '1972-05-26',  2200, NULL,  40);

1 row created.

SQL> insert into employees values(9,'Yellow', 'C',  'DIRECTOR',10,  date '1973-04-27',  2300, NULL,  20);

1 row created.

SQL> insert into employees values(10,'Pink',  'J',  'SALESREP',null,date '1974-03-28',  2400, 0,     30);

1 row created.

SQL>
SQL>
SQL> create or replace VIEW dept20_v as
  2  select * from employees where deptno = 20;

View created.

SQL>
SQL> create TABLE dept20_t as
  2  select * from employees where deptno = 20;

Table created.

SQL>
SQL> create MATERIALIZED VIEW dept20_mv as
  2  select * from employees where deptno = 20;
select * from employees where deptno = 20
                                       *
ERROR at line 2:
ORA-12014: table 'EMPLOYEES' does not contain a primary key constraint


SQL>
SQL>
SQL> drop table dept20_t;

Table dropped.

SQL> drop materialized view dept20_mv;
drop materialized view dept20_mv
*
ERROR at line 1:
ORA-12003: materialized view "JAVA2S"."DEPT20_MV" does not exist


SQL>
SQL> drop table employees;

Table dropped.

SQL>










8.9.Materialized View
8.9.1.Create materialized view
8.9.2.drop materialized view
8.9.3.alter MATERIALIZED VIEW dept20_mv enable query rewrite