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create table customer ( customer_id int, first_name char(10), last_name char(10), age int, country char(10) ) ; insert into customer values(1,' Dev','Gohil', 19,'India') ; insert into customer values(2,'Ansh','suthar', 12,'USA') ; insert into customer values(3,'Vansh','Parmar', 15,'china') ; insert into customer values(4,'sujal','waghela', 15,'srilanka') ; insert into customer values(5,'gaurav','chauhan', 23,'srilanka') ; select * from customer; alter table customer add constraint custprimary primary key(customer_id); create table orders ( order_id int, item char(10), amount char(10), customer_id int references customer(customer_id) ) ; insert into orders values(1,'keyboard', 400,4); insert into orders values(2,'mouse', 300,4); insert into orders values(3,'monitor', 12000,3); insert into orders values(4,'keyboard', 400,1); insert into orders values(5,'mousepad', 250,2); select * from orders; select * from orders where customer_id in (select customer_id from customer where first_name='Dev') ; update customer set first_name=UPPER(first_name) ; select * from customer; select LTRIM(first_name) from customer;