Question

我有一个产品表，其中包含创建日期，价格，价格，.......和多列。我需要一个选择语句，该语句返回10条最新记录，10条最低价格和评价最高的产品彼此分开的结果

(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

其中（newest_list price_list rateList_list）是不同的表结果

采用哪种更好的方法来解决这个问题。谢谢。

Answer 1

您基本上想要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

如果您不想重复，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;

SQL Server在同一表上使用不同的select语句，结果不同

1 个答案: