view_seq_syn - Lab Exercise

    1. create a view whose deptno=10 and 20.

    2. create a view without a table then create a table and compile the view.

    3. create the readonly view for the emp table deptno=30.

    4. create a table from scott. emp3 from emp add a column sno,
       if data is insert into table the sno column should be increment by 1.