从两个表中选择最大值、最小值

我有两张桌子。不同之处在于，归档是一个表，另一个保存当前记录。这些是记录公司销售额的表格。在这两个字段中，我们都有其他字段：id、名称、销售价格。我需要从两个表中选择给定名称的最高价格和最低价格。我尝试处理查询：

select name, max (price_of_sale), min (price_of_sale)
from wapzby
union
select name, max (price_of_sale), min (price_of_sale)
from wpzby
order by name

但这样的查询会吸引我两条记录——一条是当前表，一条是归档表。我想立即从两个表中为最小和最大价格选择一个名称。我如何得到这个查询？

这里有两个选项（符合 MSSql）

注意：UNION ALL 将合并集合而不消除重复项。这是比 UNION 简单得多的行为。

SELECT Name, MAX(Price_Of_Sale) as MaxPrice, MIN(Price_Of_Sale) as MinPrice
FROM
(
    SELECT Name, Price_Of_Sale
    FROM wapzby
    UNION ALL
    SELECT Name, Price_Of_Sale
    FROM wpzby
) as subQuery
GROUP BY Name
ORDER BY Name

这个在组合集合之前计算出每个表中的最大值和最小值——这样做可能会更高效。

SELECT Name, MAX(MaxPrice) as MaxPrice, MIN(MinPrice) as MinPrice
FROM
(
    SELECT Name, MAX(Price_Of_Sale) as MaxPrice, MIN(Price_Of_Sale) as MinPrice
    FROM wapzby
    GROUP BY Name
    UNION ALL
    SELECT Name, MAX(Price_Of_Sale) as MaxPrice, MIN(Price_Of_Sale) as MinPrice
    FROM wpzby
    GROUP BY Name
) as subQuery
GROUP BY Name
ORDER BY Name