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Materialized view

  

Materialized view



 CREATE MATERIALIZED VIEW EMP_MV

      BUILD IMMEDIATE

       REFRESH COMPLETE

        ENABLE QUERY REWRITE

        AS SELECT DEPTNO, SUM(SAL) FROM EMP

   GROUP BY DEPTNO


refresh method of a Materialized view

exec dbms_mview.refresh('MV1');

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  --sample tables DROP TABLE EMP; DROP TABLE DEPT; DROP TABLE BONUS; DROP TABLE SALGRADE; DROP TABLE DUMMY;   CREATE TABLE EMP        (EMPNO NUMBER(4) NOT NULL,         ENAME VARCHAR2(10),         JOB VARCHAR2(9),         MGR NUMBER(4),         HIREDATE DATE,         SAL NUMBER(7, 2),         COMM NUMBER(7, 2),         DEPTNO NUMBER(2));   INSERT INTO EMP VALUES         (7369, 'SMITH',   'CLERK',      7902,         TO_DATE('17-DEC-1980', 'DD-MON-YYYY'),   800, NULL, 20); INSERT INTO EMP VALUES         (7499, 'ALLEN',   'SALESMAN',   7698,         TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 1600,   300, 30); INSERT INTO EMP VALUES         (7521, 'WARD',    'SALESMAN',   7698,         TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 1250,   500, 30); INSERT INTO EMP VALUES         (7566, 'JONES',   'MANAGER',    7839,         TO_DATE('2-APR-1981', 'DD-MON-YYYY'),   2975, NULL,