SQL Query logic

Question

Hi There,

I have a requirement with the source data as shown below. At Customer ID level based on Date ascender order, i need to populate the min value for all null records. Could you plz help me with the logic.

Thanks in advance.
Santosh S

Answer 1

Hi @Santosh Kumar
Please check this :

;WITH CTE AS  
(SELECT T.*,C.Region AS New_Region   
 FROM Your_table  T CROSS APPLY(SELECT TOP(1)Region FROM Your_table   
                                WHERE Region IS NOT NULL AND custumerID=T.custumerID   
                                ORDER BY Date)C  
)--SELECT * FROM CTE WHERE Region IS NULL  
UPDATE CTE   
SET Region=New_Region  
WHERE Region IS NULL  

Best regards,
LiHong

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