Question

我有一个CTE，它给了我760行的结果。而且我有另一个SELECT语句，它给了我722行。我想看看CTE中存在哪些SELECT语句中不存在的记录。我正在使用NOT EXISTS语句，但由于某种原因它不会给我任何结果。我也试过NOT IN - 但是相同......没有记录。

;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
    )

仅有760行的CTE结果如下所示：

SELECT语句给出722行的结果如下所示：

我已经完成了这个“

; 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

现在我有888行，min_tag = 2，max_tag = 2。这是否意味着我的源表中的每个策略号都重复了？

Answer 1

基本策略是选择两个数据集（PolicyNumber列表），使用union all收集它们，并找到组合中的唯一项目。

; 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)

max(tag) = 1行仅在CTE中。

Answer 2

你可以使用完整的外部联接来标记差异，在将第二个查询放入另一个cte之后，比如说cte2，你可以尝试这样的事情：

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.

如何查找来自同一源表的两个查询之间未共享的行

2 个答案: