Question

使用MS Query，以下代码有效，它找到“销售价格”模式并在Excel 2007中显示。

(Connection code here has been omitted)
SELECT TOP 1 "Sales Price" AS "SPrice Mode", COUNT(*) Frequency
FROM "Sales Table" WHERE ("Date of Sale" BETWEEN ? AND ?) AND (City LIKE ?)
GROUP BY "Sales Price"
ORDER BY Frequency DESC 
Enter Start Date        Enter END Date  Enter City

我想修改此查询，以便它还可以找到2个其他字段的模式，“每单位价格”和“每SF的价格”，两者都在“销售价格”中的“销售表”中。此外，我希望用户只需输入一次参数。搜索网后，我找不到解决方案。我尝试过使用UNION和JOIN的变体，但无济于事。任何帮助或指导将不胜感激。提前谢谢。

Answer 1

您可以使用窗口函数获取多列的模式。在以下查询中，最里面的查询计算每个值的计数。下一个子查询获取最大计数，最外面的查询获取最大计数的变量值：

select max(case when cnt_sp = max_cnt_sp then "Sales Price" end) as mod_Sales_Price,
       max(case when cnt_ppu = max_cnt_ppu then "Price Per Unit" end) as mod_Price_Per_Unit,
       max(case when cnt_ppsf = max_cnt_ppsf then "Price Per SF" end) as mod_Price_Per_SF       
from (select st.*,
             max(cnt_sp) over () as max_cnt_sp,
             max(cnt_ppu) over () as max_cnt_ppu,
             max(cnt_ppsf) over () as max_cnt_ppsf
      from (select st.*,
                   count(*) over (partition by "Sales Price") as cnt_sp,
                   count(*) over (partition by "Price Per Unit") as cnt_ppu,
                   count(*) over (partition by "Price Per SF") as cnt_ppsf
            from "Sales Table" st
           ) st
     ) st

MS查询 - 在多于1个字段上计算模式

1 个答案: