create table products_extended (
id INT primary key,
name VARCHAR(100) not null,
category VARCHAR(50),
price DECIMAL(10, 2),
in_stock BOOLEAN default true,
email_support VARCHAR(50)
);

insert into products_extended (id, name, category, price, in_stock, email_support)
values (1, 'Mi Band 7', 'smartwatch', 49, true, 'miband@xiaomi.com');

insert into products_extended (id, name, category, price, in_stock, email_support)
values (2, 'Surface Pro', 'tablet', 1299, true, 'surface@microsoft.com');

select * from products_extended -- проверил как выглядит таблица

alter table products_extended
add column rating DECIMAL(5, 2);

truncate table products_extended;

drop table products_extended