Question

我正在尝试对表进行查询酒店，房型，roomprice，我正在努力获得罗孚总和作为＆＃34;总单人房＆＃34; roomtype = single 按酒店分组所以我最终得到了酒店和＃34; Total Single rooms＆＃34;

我一直在尝试不同的方式，但我似乎无法让它发挥作用。是的我是SQL lol的新手

由于

Answer 1

如果符合您的要求，您应该接受MrVimes解决方案。如果您想要包含酒店连锁总数，您可以使用汇总到该组，例如： -

/*drop table t;
create table t (hotel varchar(3),roomtype varchar(1),price decimal(10,2));
truncate table t;
insert into t values 
('abc','s',10.00),
('abc','s',10.00),
('abc','s',30.00),
('abc','d',10.00),
('def','s',10.00),
('def','s',10.00),
('abc','d',10.00),
('abc','d',10.00),
('abc','d',10.00);
*/

select  case
            when s.hotel is not null then s.hotel
            else 'Total'
            end as hotel,
            s.totalsinglerooms
from
(
select  hotel, sum(price) as totalsinglerooms
from      t
where     roomtype = 's'
group   by hotel with rollup
) s

结果

+-------+------------------+
| hotel | totalsinglerooms |
+-------+------------------+
| abc   |            50.00 |
| def   |            20.00 |
| Total |            70.00 |
+-------+------------------+

Answer 2

select hotelno,sum(roomprice) as `Total Single Rooms` from room
where roomtype = 'single'
group by hotelno
having sum(roomprice) > 100

查询sum，where条件和group by

2 个答案: