SQL：用3个不同的where子句查询同一列3次

Question

正在尝试显示一个 table，其中有 3 列是需要显示的价格。这些列由 'price_type' 区分，并且有 3 种不同的价格类型。

这可能是我明显遗漏的东西，但类似于：

Select price as 'current', price as '10min', price as '30min'
from table
where Price_Type(current) = 'current' AND Price_Type(10min) = '10min' AND 
Price_Type(30min) = '30min'
Order by date desc

我不确定实际语法是什么，但如有任何帮助，我们将不胜感激。

Answer 1

有条件聚合：

select date,
  max(case when Price_Type = 'current' then price end) as [current],
  max(case when Price_Type = '10min' then price end) as [10min],
  max(case when Price_Type = '30min' then price end) as [30min]
from table
group by date
order by date desc