條件求和並計數的Teradata（SQL幫助）

Question

我的數據是建立在以下方式：

Person Account Revenue Region 
    A  W  100  AU 
    A  W  200  AU 
    A  W  300  AU 
    B  X  200  AU 
    B  X  50  CH 
    B  X  50  CH 

下面是樣本數據代碼：

IF OBJECT_ID('tempdb..#StackTest') IS NOT NULL 
    DROP TABLE #StackTest; 

CREATE TABLE #StackTest 
(Person varchar(1) 
, Account varchar(1) 
, Revenue int 
, Region varchar(2)); 

INSERT INTO #StackTest 
(Person 
, Account 
, Revenue 
, Region) 
VALUES 
('A', 'W', 100, 'AU'), 
('A', 'W', 200, 'AU'), 
('A', 'W', 300, 'AU'), 
('B', 'X', 200, 'AU'), 
('B', 'X', 50, 'CH'), 
('B', 'X', 50, 'CH'); 

我需要寫一個SQL只有當賬戶Q的總和超過Y時，纔會對這些賬戶的收入進行求和。同樣​​，當賬戶Q的總和超過Y時，我也需要只計算那些賬戶。因此，如果我的區域AU的總和閾值爲500，地區CH是200，那麼我想要以下輸出

Output # of accounts exceeding threshold sum Revenue from these accounts 
A      1         600  
B      0         0 

但是，我當前的查詢是單獨檢查每個行項目，而不是在帳戶級別。

我該怎麼辦？

Answer 1

在標準SQL中，您將使用兩級聚合。我懷疑，查詢是這樣的：

select person, 
     sum(case when region = 'AU' and revenue > 500 then 1 
       when region = 'CH' and revenue > 200 then 1 
       else 0 
      end) as numAccounts, 
     sum(case when region = 'AU' and revenue > 500 then revenue 
       when region = 'CH' and revenue > 200 then revenue 
       else 0 
      end) as reveue, 
from (select person, region, sum(revenue) as revenue 
     from t 
     group by person, region 
    ) t 
group by person; 

Answer 2

下面的查詢將通過人/區域聚集，然後才能產生結果應用於從單獨的表區域的閾值。

更新，考慮單獨區域的閾值

IF OBJECT_ID('tempdb..#Thresholds') IS NOT NULL 
    DROP TABLE #Thresholds 
CREATE TABLE #Thresholds (Region VARCHAR(2), Revenue INT) 
INSERT #Thresholds VALUES ('AU', 500), ('CH', 200) 

--DECLARE @Threshold INT = 500 
SELECT 
    T.Person, 
    SUM(CASE WHEN T.[Revenue] >= Thresholds.Revenue THEN T.[Count] ELSE 0 END) AS [# of accounts exceeding threshold sum], 
    SUM(CASE WHEN T.[Revenue] >= Thresholds.Revenue THEN T.[Revenue] ELSE 0 END) AS [Revenue from these accounts] 
FROM (
    SELECT 
     Person, 
     Region, -- Add region to apply thresholds by region 
     COUNT(DISTINCT Account) AS [Count], 
     SUM(Revenue) AS [Revenue] 
    FROM #StackTest 
    GROUP BY Person, Region 
) T 
    INNER JOIN #Thresholds Thresholds 
     ON Thresholds.Region = T.Region 
GROUP BY Person 
ORDER BY Person