如何查找來自同一個源表的兩個查詢之間不共享的行

Question

我有一個CTE，它給了我760行的結果。我還有另外一個SELECT聲明給我722行。 我想查看在CTE中存在的哪些記錄不存在於SELECT聲明中。 我使用NOT EXISTS聲明，但由於某種原因，它不給我任何結果。我也嘗試過NOT IN - 但是沒有記錄。

;WITH Cte_Policies AS 
     (
     SELECT 
      PolicyNumber, 
      ControlNo, 
      EffectiveDate, 
      ExpirationDate, 
      ProducerName, 
      SUM(BOUND_Premium) as NetWrittenPremium 
     FROM CatalyticWindEQ 
     WHERE EffectiveDate >= '05-01-2016' AND EffectiveDate <= EOMONTH(GETDATE())  
       AND LineName = 'Earthquake' AND Underwriter <> 'Batcheller, Jerry' AND PolicyNumber IS NOT NULL 
     GROUP BY 

       ProducerName, 
       EffectiveDate 
       ,ExpirationDate ,PolicyNumber, ControlNo 
     ) 
SELECT PolicyNumber, 
     ControlNo, 
     YEAR(EffectiveDate) as PolicyEffectiveYear, 
     MONTH(EffectiveDate) as PolicyEffectiveMonth, 
     NetWrittenPremium, 
     ProducerName as Producer 


FROM 
    Cte_Policies 


    where 
    NOT EXISTS 

    (
     SELECT 
        PolicyNumber 
     FROM  CatalyticWindEQ eq 
     WHERE  EffectiveDate>='05-01-2016' AND EffectiveDate <= EOMONTH(GETDATE()) AND LineName = 'Earthquake' AND Underwriter <> 'Batcheller, Jerry' 
        AND PolicyNumber IS NOT NULL 
        and eq.PolicyNumber=Cte_Policies.PolicyNumber 
     GROUP BY PolicyNumber 
    ) 

從CTE只有760行的結果看起來是這樣的：

而且從SELECT語句，讓722行的結果看起來是這樣的：

我已經這樣做了「

; with CTE as 
(
     SELECT 
      PolicyNumber, 
      ControlNo, 
      EffectiveDate, 
      ExpirationDate, 
      ProducerName, 
      SUM(BOUND_Premium) as NetWrittenPremium 
     FROM CatalyticWindEQ 
     WHERE EffectiveDate >= '05-01-2016' AND EffectiveDate <= EOMONTH(GETDATE())  
       AND LineName = 'Earthquake' AND Underwriter <> 'Batcheller, Jerry' AND PolicyNumber IS NOT NULL 
     GROUP BY 

       ProducerName, 
       EffectiveDate 
       ,ExpirationDate ,PolicyNumber, ControlNo 
     ) 
SELECT PolicyNumber, 

     min(tag) as min_tag, 
     max(tag) as max_tag 


FROM 
     (
     SELECT PolicyNumber, 1 as tag FROM CTE 
    UNION ALL 
     SELECT PolicyNumber, 2 as tag FROM CatalyticWindEQ 
     ) U 
GROUP BY PolicyNumber 
HAVING COUNT(*)=1 

現在我有888行min_tag = 2和max_tag = 2。這是否意味着每個保單號碼都被複制到我的源表中？

Answer 1

的基本策略是選擇兩個數據集（的PolicyNumber列表），使用union all收集他們，並找到該組合的唯一項目。

; with CTE as (...) -- the CTE from above 
Select PolicyNumber, min(tag) as min_tag, max(tag) as max_tag from (
    select PolicyNumber, 1 as tag from CTE 
    union all 
    select PolicyNumber, 2 as tag from CatalyticWindEQ -- the source you're matching 
) U 
Group by PolicyNumber 
Having count(*) =1 -- equivalently, having min(tag) = max(tag) 

行max(tag) = 1只在CTE。

Answer 2

你可以使用全外連接標誌的差異，把你的第二個查詢另一個CTE裏面後，說CTE2，你可以嘗試這樣的事：

select 
    a.PolicyNumber, 
    a.ControlNo, 
    a.YEAR(EffectiveDate) as PolicyEffectiveYear, 
    a.MONTH(EffectiveDate) as PolicyEffectiveMonth, 
    a.NetWrittenPremium, 
    a.ProducerName as Producer, 
    b.PolicyNumber 
from Cte_Policies as a 
full outer join cte2 as b ON b.PolicyNumber=a.PolicyNumber 
where 
     a.PolicyNumber is null -- will show records NOT in cte. 
    OR b.PolicyNumber is null -- Will show records NOT in cte2.