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create database db1; 

use db1; 

CREATE TABLE customers  
(id int(10),  
 name varchar(50),  
 city varchar(50),
 PRIMARY KEY (id )  
);  

ALTER TABLE customers 
ADD age varchar(50);  

insert into customers values(101,'rahul','delhi');

update customers set name='bob', city='london' where id=101;

delete from customers where id=101;

SELECT * from customers;

truncate table customers;

drop table customers;

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