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create table Orders ( id int NOT NULL, price int NOT NULL, discount_code int NULL ); create table Discounts ( id int not null, value int not null ); insert into Orders values (1, 10, null), (2, 10, null), (3, 5, 1), (4, 25, 1); insert into Discounts values (1, 3); select sum(if(o.discount_code is not null, o.price - d.value, o.price)) from Orders as o left join Discounts as d on o.discount_code = d.id; -- 10 + 10 + 2 + 22 = 44
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