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Sql Query- Null values

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Last Modified: 2014-01-20
Hello I have the below query
SELECT 'VA',  CONVERT(char(10),Entered,101),COUNT(RXNO) FROM  HRXS
 WHERE 
-- AND  
 NewRx=1 
 AND PharmID ='VA' and TransType not in('Q','B') and  (CCType IS NULL OR CCType ='C') 
 and Entered is not null and  CONVERT(char(10),Entered,101) between CONVERT(char(10),GETDATE()-31,101) and CONVERT(char(10),GETDATE(),101)
 
GROUP BY CONVERT(char(10),Entered,101)

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Somewhere in the data there is null value for the entered field and so its returning no data,but if I comment the where condition on the entered field its returning data.How to handle this?
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