MySql的多个平均值

Question

我有一张桌子，上面有一些不同类型的酒店房间的价格。 我想查询，以便获得每个房间的平均价格，但是mySQL只会给我1个平均值，而不是我需要的2个平均值。 我的代码如下：

SELECT AVG(Price) From `Room` WHERE (Type='Double') OR (Type='single');

我想这是我的OR陈述，似乎让我很烦。

Answer 1

SELECT AVG(Price), `Type`
FROM `Room`
GROUP BY `Type`

Answer 2

SELECT AVG(case when Type='Double' then Price else 0 end) as avg_double_price,
       AVG(case when Type='Single' then Price else 0 end) as avg_single_price,
       sum(Type='Double') as double_count,
       sum(Type='Single') as single_count
From `Room`