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create table products (
id int primary key auto_increment,
name text,
manufacturer varchar(64)
);
insert into products (name, manufacturer) values
('Носки', 'Фабрика Восход'), ('Трусы', 'Фабрика Восход')
, ('Трусы', 'Фабрика Заря');
create table spent (
product_id int references products(id),
created_at timestamp default current_timestamp
);
insert into spent (product_id) values (1);
select
products.*,
case when bad_manufacturers.manufacturer is null then 'Хороший производитель' else 'Бракодел' end manufacturer_rate
from products
left join (
select distinct manufacturer
from spent s
join products p on p.id = s.product_id
) bad_manufacturers using (manufacturer)
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