SQL Server在同一张表上的不同选择语句和不同的结果

Question

我有一个产品表，其中包含创建日期、价格、费率......和多个列我需要一个选择语句来返回 10 个最新记录、10 个最低价格和最高评价的产品作为彼此分离的结果，例如

(select top 10 from products Order By Date ASC ) as newest_list
(select top 10 from products Order By price DESC ) as price_list
(select top 10 from products Order By Rate ASC ) as rateList_list 

where ( latest_list price_list rateList_list) 是不同的表结果

有什么更好的方法来处理这个结果。谢谢。

Answer 1

你基本上想要 union all 。 . .和一个子查询：

select *
from ((select top 10 'newest' as which, p.*
       from products p
       Order By Date ASC
      ) union all
      (select top 10 'priciest', p.*
       from products p
       Order By price DESC
      ) union all
      (select top 10 'ratiest', p.*
       from products p
       Order By Rate ASC
      )
     ) p

如果不想重复，可以使用union或窗口函数：

select p.*
from (select p.*,
             row_number() over (order by date desc) as seqnum_d,
             row_number() over (order by price desc) as seqnum_p,
             row_number() over (order by rate asc) as seqnum_r
      from p
     ) p
where seqnum_d <= 10 or seqnum_p <= 10 or seqnum_r <= 10;