从联盟中选择案例

-2

为了报告和创建报告（MS SQL SERVER 2014）的目的，该报告将比较上周同一天和上个月同一天的交易数量和金额数量，我需要一些像这样的查询，这是不工作：从联盟中选择案例

Select 
    Acquirer = case when Date = @Day then a.Acquirer 
        when Date = @LastWeekDay then b.Acquirer 
        when Date = @LastMonthDay then c.Acquirer 
       end 
, RC =  case when Date = @Day then a.RC 
        when Date = @LastWeekDay then b.RC 
        when Date = @LastMonthDay then c.RC 
       end 
, Desc =  case when Date = @Day then a.Desc 
        when Date = @LastWeekDay then b.Desc 
        when Date = @LastMonthDay then c.Desc 
       end 
, Day_Tr_Count = case when Date = @Day then a.Count end 
, LWD_Tr_Count = case when Date = @LastWeekDay then b.Count end 
, LMD_Tr_Count = case when Date = @LastMonthDay then c.Count end 
, Day_Tr_Amount = case when Date = @Day then a.Amount end 
, LWD_Tr_Amount = case when Date = @LastWeekDay then b.Amount end 
, LMD_Tr_Amount = case when Date = @LastMonthDay then c.Amount end 

from 
    (select * from T1 
    union 
    select * from T2 
    union 
    select * from T3) x 
group by Acquirer,RC,Desc

所有3台拥有漂亮的结构相同：

T1,T2,T3(acquirer,RC,Desc,Count,Amount,Date).

报告应该是：

result_table(Acquirer,RC,Desc,Daily_Count,Last_Week_Day_Count,Last_Month_Count,Daily_Amount,Last_Week_Day_Amount,Last_Month_Day_Amount)

来源

2017-10-13 Darko Milic

第1步：您可能需要'UNION ALL'。 – jarlh

它是如何*不工作*？ –

一般的GROUP BY规则说：“如果指定了GROUP BY子句，则SELECT列表中的每个列引用都必须标识分组列或作为set函数的参数。” – jarlh

嗯。您有一个没有group by的聚合查询。也许：

Select v.Acquirer, v.RC, v.Desc, 
     Day_Tr_Count = sum(case when Date = @Day then a.Count end), 
     LWD_Tr_Count = sum(case when Date = @LastWeekDay then b.Count end), 
     LMD_Tr_Count = sum(case when Date = @LastMonthDay then c.Count end), 
     Day_Tr_Amount = sum(case when Date = @Day then a.Amount end 
     LWD_Tr_Amount = sum(case when Date = @LastWeekDay then b.Amount end), 
     LMD_Tr_Amount = sum(case when Date = @LastMonthDay then c.Amount end) 

from (select * from T1 
     union all 
     select * from T2 
     union all 
     select * from T3 
    ) x cross apply 
    (values (case when Date = @Day then a.Acquirer 
        when Date = @LastWeekDay then b.Acquirer 
        when Date = @LastMonthDay then c.Acquirer 
       end, 
       case when Date = @Day then a.RC 
        when Date = @LastWeekDay then b.RC 
        when Date = @LastMonthDay then c.RC 
       end, 
       case when Date = @Day then a.Desc 
        when Date = @LastWeekDay then b.Desc 
        when Date = @LastMonthDay then c.Desc 
       end 
      ) v (Acquirer, RC, Desc) 
group by v.Acquirer, v.RC, v.Desc;

注：desc是一列（或任何其他）的名声。这是一个SQL关键字（想想order by）。

来源

2017-10-13 10:52:47

从联盟中选择案例

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