Saturday, March 10, 2012

VIEWS ex:9 DBMS Lab


VIEWS


SQL> create view view4 as(select account.accno,account.balance, depositer.custid, depositer.bname from account,depositer where account.accno=depositer.accno);
View created.

SQL> select * from view4;
     ACCNO    BALANCE     CUSTID BNAME
---------- ---------- ---------- --------------------
      1701      17859        111 State Bank
      1702      63875        112 TMB
      1703      52985        113 IOB
      1704      75426        114 Syndicate
      1705      42987        115 Baroda

SQL> create view view5 as select c.custid,c.cname,c.address,d.accno,d.bname from customer c,depositer d where c.custid=d.custid;
View created.

SQL> select * from view5;
    CUSTID CNAME                ADDRESS                   ACCNO    BNAME
---------- -------------------- -------------------- ----------     --------------------
       111 Sunil                1,Nehru St,Erode           1701             State Bank
       112 Kishore              2,Gandi St,Mdu             1702           TMB
       113 Harish               3,Rajaji St,Cng            1703                IOB

    CUSTID CNAME                ADDRESS                   ACCNO    BNAME
---------- -------------------- -------------------- ----------     --------------------
       114 Akil                 4,Bose St,Vnr              1704   Syndicate
       115 Angel                5,PT St,Tmm                1705              Baroda

SQL> create view view6 as select * from empl where address='madurai';
View created.

SQL> select * from view6;
no rows selected

SQL> insert into view6 values(&empno,'&empname','&address',&pay, '&qualification');
Enter value for empno: 1000
Enter value for empname: Sunil
Enter value for address: madurai
Enter value for pay: 12000
Enter value for qualification: B.Sc.
old   1: insert into view6 values(&empno,'&empname','&address',&pay,'&qualification')
new   1: insert into view6 values(1000,'Sunil','madurai',12000,'B.Sc.')

1 row created.

SQL> select * from view6;
     EMPNO EMPNAME              ADDRESS           PAY                  QUALIFICATION
---------- -------------------- --------------------     ----------     ----------------------
      1000               Sunil                madurai                   12000    B.Sc.

SQL> select * from empl;
     EMPNO EMPNAME              ADDRESS           PAY                 QUALIFICATION
---------- -------------------- --------------------     ----------     ----------------------
       101                 Ashok                6,Lalu St,Mdu              8000                      B.com
       102                 Sharan               7,NGO Nagar,Vnr            7500         B.Ed
       103                 Tharun               8,KK Nagar,Ed             12000          B.E.

     EMPNO EMPNAME              ADDRESS           PAY                 QUALIFICATION
---------- -------------------- --------------------     ----------     ----------------------
       104                 Shailesh             9,PTN St,Tmm       18000                               B.E.
       105                 Eashan               5,Raja St,Tmm       42000                               B.E.
      1000               Sunil                     madurai                  12000                                B.Sc.

6 rows selected.
SQL> alter table account add primary key(accno);
Table altered.

SQL> delete from view4 where accno=1704;
1 row deleted.

SQL> select * from view4;
     ACCNO    BALANCE     CUSTID BNAME
---------- ---------- ---------- --------------------
      1701      17859        111            State Bank
      1702      63875        112            TMB
      1703      52985        113            IOB
      1705      42987        115            Baroda

SQL> alter table depositer add constraint dp foreign key(accno)references account(accno);
Table altered.

SQL> alter table customer add primary key (custid);
Table altered.

SQL> update view5 set bname='AXIS CHN' where cname='Angel';
1 row updated.

SQL> select * from view5;
    CUSTID      CNAME                ADDRESS                   ACCNO               BNAME
---------- -------------------- -------------------- ----------         --------------------
       111                 Sunil                1,Nehru St,Erode       1701 State Bank
       112                 Kishore              2,Gandi St,Mdu        1702                TMB
       113                 Harish               3,Rajaji St,Cng            1703                IOB

    CUSTID      CNAME                ADDRESS                   ACCNO               BNAME
---------- -------------------- -------------------- ----------         --------------------
       115                Angel                5,PT St,Tmm                1705              AXIS CHN

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