從聯盟中選擇案例

-2

爲了報告和創建報告（MS SQL SERVER 2014）的目的，該報告將比較上週同一天和上個月同一天的交易數量和金額數量，我需要一些像這樣的查詢，這是不工作：從聯盟中選擇案例

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臺擁有漂亮的結構相同：

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

報告應該是：

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

來源

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規則說：「如果指定了GROUP BY子句，則SELECT列表中的每個列引用都必須標識分組列或作爲set函數的參數。」 – jarlh

嗯。您有一個沒有group by的聚合查詢。也許：

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）的名聲。這是一個SQL關鍵字（想想order by）。

來源

2017-10-13 10:52:47

從聯盟中選擇案例

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