Alter table to add two columns to a table

   
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', 'YourName@q.com');

1 row created.

SQL>
SQL> insert into people values (2, 'S', 'Dillon', 'sdillon@q.com');

1 row created.

SQL>
SQL> insert into people values (3, 'C', 'Beck', 'clbeck@q.com');

1 row created.

SQL>
SQL> select * from people;

EMPLOYEE_ID FIRST_NAME      LAST_NAME            EMAIL
----------- --------------- -------------------- -------------------------
          1 T               Kyte                 YourName@q.com
          2 S               Dillon               sdillon@q.com
          3 C               Beck                 clbeck@q.com

SQL>
SQL>
SQL> alter table people
  2  add(
  3    t_name varchar2(40),
  4    st_name varchar2(15)
  5  );

Table altered.

SQL>
SQL> select * from people;

EMPLOYEE_ID FIRST_NAME      LAST_NAME            EMAIL                     T_NAME                           ST_NAME
----------- --------------- -------------------- ------------------------- ---------------------------------------- ---------------
          1 T               Kyte                 YourName@q.com
          2 S               Dillon               sdillon@q.com
          3 C               Beck                 clbeck@q.com

SQL>
SQL> drop table people;

Table dropped.

SQL>

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4.	Use alter table to add foreign key with cascade delete
5.	Use alter table to add foreign key with cascade delete for more than one column
6.	Alter table to add a foreign key ON DELETE SET NULL
7.	Alter to add DELETE ON NULL with more than one column
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.

Alter table to add two columns to a table : Alter Table « Table « Oracle PL / SQL

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