This document discusses various SQL commands for inserting, modifying, and deleting data from database tables. It shows how to create a table, insert sample data, create a new table with the structure and data of an existing table, add and drop columns, modify column properties, and finally remove an entire table.

1. Inserting Data into a Table
============================
CREATE TABLE emp ( ecode integer, ename varchar(20) , gender
varchar(1) , grade varchar(2), basic number(7) ) ;
Desc emp
Create table from table
======================
create table emp1 as select * from emp;
Desc emp1
Adding column to table
===========================
Desc emp1
Alter table emp1 add gross number(7) ;
Desc emp1
deleting column from table
=============================
alter table emp1 drop column gross;
Desc emp1
Modifying Column
=================
create table pending_orders
(
POID int,
Reason varchar(10)
);
insert into pending_orders values (100,'Customer Request');
alter table pending_orders modify reason varchar2(100);
desc pending_orders
select * from pending_orders;
Removing the table
================
drop table pending_orders;