sql-server - 使用/CTE 语句进行调整

Question

使用 SQL Server 2012 .... 此代码作为独立脚本工作，但我需要在iif(...)嵌套在 a中返回的值Case...when作为更大脚本的一部分：

with GroupedValues (Value, Frequency, SelectingCriteria) AS
(Select
    Table1.Cost as Value,
    Count(*) as Frequency,
Table2.AccountNumber as SelectingCriteria

from Table1, Table 2 
)

Group by Table1.Cost, Table2.AccountNumber) 

Select
    Max(Value) as Value
From GroupedValues a INNER JOIN
    (select Max(Frequency) AS MaxFrequency
     from GroupedValues) b
on a.Frequency=b.MaxFrequency 

Answer 1

我相信你只是这样做：

select top 1 
  Value
from (
  select
    Table1.Cost, Table2.AccountNumber
    Count(*) as Frequency,
    Table1.Cost as Value
  from Table1 cross join Table2 
  group by Table1.Cost, Table2.AccountNumber, Table1.Cost 
) T
order by 
  Frequency desc, 
  Value desc