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1.GRANT  //授权

  GRANT  CREATE VIEW TO SCOTT;

2.CREATE VIEW

  CREATE OR  REPLACE   VIEW V1 AS

                                                                 SELECT * FROM  EMPNO,SAL FROM EMP;

3.SELECT VIEW    // VIEW  IS VIRTUAL,THIS IS A VIRTUAL TABLE;

   SELECT * FROM V1;

4.ANOTHER  NAME

    CREATE OR REPLACE V2(ID,NAME,SAL) AS  SELECT  EMPNO,ENAME,SAL FROM EMP;

    SELECT * FROM V2 WHERE ID=7369;

5.SELECT TABLE_NAME,COLUMN_NAME,UPDATETABLE,INSERTABLE,DELETEABLE FROM  TABLE  WHERE TABLE_NAME='EMP';

6.  ADD  VIEW DATA

    INSERT INTO VIEW VALUES(1,'TOM',15);

7.WIDTH READ ONLY

   CREATE OR REPLACE VIEW V3 AS SELECT ENAME FROM EMP WITH READ ONLY;

8.WITH CHECK OPTION  //CHECK VIEW   约束就是where后面的条件

   CREATE OR REPLACE VIEW V4 AS SELECT ENAME,SAL FROM EMP WHERE DEPTNO=20 WITH CHECK OPTION CONSTRAINT VM_CK;

8.//复杂视图

CREATE OR REPLACE VIEW  V4 AS SELECT D.DNAME,E.ENAME FROM EMP E.DEPT D WHERE D.DEPTNO=E.DEPTNO GROUP BY DEPTNO;

   SELECT * FROM V4;

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