Alter table to add Columns in Tables : Alter Table « Table « Oracle PL / SQL

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Alter table to add Columns in Tables

   
SQL>
SQL> create table people(
  2    employee_id     number(9),
  3    first_name      varchar2(15),
  4    last_name       varchar2(20),
  5    email           varchar2(25),
  6    constraint pk_people primary key (employee_id)
  7  );

Table created.

SQL>
SQL> insert into people values (1, 'T', 'Kyte', '[email protected]');

1 row created.

SQL>
SQL> insert into people values (2, 'S', 'Viper', '[email protected]');

1 row created.

SQL>
SQL> insert into people values (3, 'C', 'Beck', '[email protected]');

1 row created.

SQL>
SQL> commit;

Commit complete.

SQL>
SQL> select * from people;

EMPLOYEE_ID FIRST_NAME      LAST_NAME            EMAIL
----------- --------------- -------------------- -------------------------
          1 T               Kyte                 [email protected]
          2 S               Viper                [email protected]
          3 C               Beck                 [email protected]

SQL>
SQL> alter table people
  2  add (
  3    phone_number    varchar2(10)
  4  );

Table altered.

SQL>
SQL> select * from people;

EMPLOYEE_ID FIRST_NAME      LAST_NAME            EMAIL                     PHONE_NUMB
----------- --------------- -------------------- ------------------------- ----------
          1 T               Kyte                 [email protected]
          2 S               Viper                [email protected]
          3 C               Beck                 [email protected]

SQL>
SQL> drop table people;

Table dropped.

SQL>










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8.Alter table to drop unused columns
9.Alter table to drop two columns in a single command
10.Marking Columns Unused
11.Alter table to change the storage
12.Alter table cache
13.Alter table to drop constraints
14.If you are adding more than one column, the column definitions should be enclosed in parentheses and separated by commas.
15.Make myCode a CACHE table.