具有 ROW_Number SQL 服务器的 2 sql 之间的内部连接

Question

我已经浏览了特定的帖子，但仍然无法解决我在两个 SQL 语句的内部联接中遇到的问题，其中有一个 Row_number 函数调用。

正在尝试从两个 table 中提取数据。我正在使用 Row_Number 来获取不同的策略，因为有很多重复值。我无法弄清楚 Inner Join 部分有什么问题。

Select * 
from 
    (Select Distinct
         PolicyReference as IRIS_Policy_Ref ,
         REPLACE(SUBSTRING(Ch.ClaimSuffix,3,4),'-','') as Claims_Seq,
         CH.AccidentDate as Loss_Date,
         CH.AccidentYear as Loss_Year,
         CH.ClaimCreatedDate as Claim_Advised_Date,
         CH.NoticeDescription as Loss_Description,
         NULL as Conv_Claim_No,
         NULL as CHI,     
         NULL as Manual, 
         BrokerRef as Broker_Code,                
         Null as Current_ACR,
         Null as Current_IBNR,
         Source ='DCT',
         ROW_NUMBER() OVER(PARTITION BY PolicyReference ORDER BY TransactionDate DESC) RowNum 
     from 
         dbo.Policy) PM 
INNER JOIN 
    dbo.Claims CH ON Ch.PolicyReference = PM.PolicyReference
where 
    PM.RowNum = 1

错误消息示例 -

Msg 4104, Level 16, State 1, Line 3
The multi-part identifier "Ch.ClaimSuffix" could not be bound.

Msg 4104, Level 16, State 1, Line 3
The multi-part identifier "Ch.AccidentDate" could not be bound.

Msg 4104, Level 16, State 1, Line 5
The multi-part identifier "CH.AccidentYear" could not be bound.

我做错了什么？它没有识别声明 table 列。

如有任何线索，我们将不胜感激。我从早上就卡在这了。

谢谢！！

Answer 1

您不能像那样在子查询中引用 Claims，因为它尚未被引入。为什么不像这样将该连接移动到主查询？

Select * 
from 
(
    Select 
        PolicyReference as IRIS_Policy_Ref ,
        REPLACE(SUBSTRING(Ch.ClaimSuffix,3,4),'-','') as Claims_Seq,
        CH.AccidentDate as Loss_Date,
        CH.AccidentYear as Loss_Year,
        CH.ClaimCreatedDate as Claim_Advised_Date,
        CH.NoticeDescription as Loss_Description,
        NULL  as Conv_Claim_No,
        NULL as CHI,     
        NULL as Manual, 
        BrokerRef as Broker_Code,                
        Null as Current_ACR,
        Null as Current_IBNR,
        Source ='DCT',
        ROW_NUMBER() OVER(PARTITION BY PolicyReference ORDER BY TransactionDate DESC) RowNum 
    from dbo.Policy P
    INNER JOIN dbo.Claims CH ON Ch.PolicyReference = P.PolicyReference
) PM 
where PM.RowNum = 1

Answer 2

许多人喜欢使用 CTE：

with table_with_rowsnums as (
Select * from (Select Distinct
PolicyReference as IRIS_Policy_Ref ,
REPLACE(SUBSTRING(Ch.ClaimSuffix,3,4),'-','') as Claims_Seq,
CH.AccidentDate as Loss_Date,
CH.AccidentYear as Loss_Year,
CH.ClaimCreatedDate as Claim_Advised_Date,
CH.NoticeDescription as Loss_Description,
NULL  as Conv_Claim_No,
NULL as CHI,     
NULL as Manual, 
BrokerRef as Broker_Code,                
Null as Current_ACR,
Null as Current_IBNR,
Source ='DCT',
ROW_NUMBER() OVER(PARTITION BY PolicyReference ORDER BY TransactionDate 
DESC) RowNum 
from dbo.Policy ) PM 
INNER JOIN dbo.Claims CH ON Ch.PolicyReference = PM.PolicyReference)
select * from  table_with_rowsnums where rownum=1

Answer 3

row_number()不需要select distinct。另外，CH 没有引用。您需要在子查询中执行 JOIN：

select * 
from (Select pm.PolicyReference as IRIS_Policy_Ref ,
             REPLACE(SUBSTRING(Ch.ClaimSuffix, 3, 4), '-', '') as Claims_Seq,
             CH.AccidentDate as Loss_Date,
             CH.AccidentYear as Loss_Year,
             CH.ClaimCreatedDate as Claim_Advised_Date,
             CH.NoticeDescription as Loss_Description,
             NULL as Conv_Claim_No,
             NULL as CHI,     
             NULL as Manual, 
             BrokerRef as Broker_Code,                
             Null as Current_ACR,
             Null as Current_IBNR,
             Source ='DCT',
             ROW_NUMBER() OVER (PARTITION BY pm.PolicyReference ORDER BY pm.TransactionDate DESC) RowNum 
         from dbo.Policy p JOIN
              dbo.Claims CH
              ON Ch.PolicyReference = PM.PolicyReference
        ) PM 
where PM.RowNum = 1 ;

具有 ROW_Number SQL 服务器的 2 sql 之间的内部连接

Inner Join between 2 sql having ROW_Number SQL Server

sql

sql-server

inner-join

row-number