编写没有汇总的 MySQL 查询

Question

我有问题。如果没有roll up，我如何编写这个sql 语句？ 我想得到相同的结果，但没有汇总。结果应如下图所示。

我的查询

select state, city, sum((sales.retail_price - products.wholesale_price) * 
sales.quantity) as profit 
from products, sales
where sales.product_id = products.product_id
group by state, city WITH ROLLUP
order by state is null, city is null, state, city ;

我的架构

-- Create some tables and insert some rows.
create table products (product_id integer, wholesale_price real);
insert into products (product_id, wholesale_price) values 
    (1, 1.00),
    (2, 2.00);

create table sales (product_id integer, retail_price real, 
    quantity integer, city varchar, state varchar);
insert into sales (product_id, retail_price, quantity, city, state) values 
    (1, 2.00,  1, 'SF', 'CA'),
    (1, 2.00,  2, 'SJ', 'CA'),
    (2, 5.00,  4, 'SF', 'CA'),
    (2, 5.00,  8, 'SJ', 'CA'),
    (2, 5.00, 16, 'Miami', 'FL'),
    (2, 5.00, 32, 'Orlando', 'FL'),
    (2, 5.00, 64, 'SJ', 'PR');

Answer 1

您必须使用 UNION 操作，如下所示： 第一个查询返回按州和城市分组的 SUM，第二个查询仅返回州，第三个查询（没有分组依据）返回所有行

select state, city, sum((sales.retail_price - products.wholesale_price) * 
sales.quantity) as profit 
from products, sales
where sales.product_id = products.product_id
group by state, city
UNION ALL 
select state, NULL, sum((sales.retail_price - products.wholesale_price) * 
sales.quantity) as profit 
from products, sales
where sales.product_id = products.product_id
group by state
UNION ALL
select NULL, NULL, sum((sales.retail_price - products.wholesale_price) * 
sales.quantity) as profit 
from products, sales
where sales.product_id = products.product_id;