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How to Validate Bank Routing Using Check Digit


How to Validate Bank Routing Using Check Digit

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Al Siks
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Comments posted to this topic are about the item How to Validate Bank Routing Using Check Digit


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Jeff Moden
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You made the mistake of using ISNUMERIC to check for digits. ISNUMERIC does not equal ISALLDIGITS... try this and see what I mean...

SELECT dbo.check_digit('072---326')

Rather than just have it return a check digit, why not have it validate the ABA routing number altogether? For example...

DECLARE @RoutingNumber VARCHAR(8000) --Allows check of wrong size numbers
    
SET @RoutingNumber = '067803457'

SELECT CASE
        
WHEN LEN(@RoutingNumber)=9
        
AND @RoutingNumber NOT LIKE '%[^0-9]%' --Check to make sure is all digits
        
AND RIGHT(@RoutingNumber ,1)
          
= (--==== Calculates check digit (Digit 9)
              
SELECT 10-SUM(mv.DigitVal)%10 --Sum of individual digit values subtracted for new number ending in 0
                
FROM (--==== Gets multiplied value for each digit in 3, 7, 1 pattern
                      
SELECT CASE
                            
WHEN (t.N-1)%3 = 0 THEN SUBSTRING(@RoutingNumber,t.N,1)*3 --Digits 1,4,7
                            
WHEN (t.N-1)%3 = 1 THEN SUBSTRING(@RoutingNumber,t.N,1)*7 --Digits 2,5,8
                            
WHEN (t.N-1)%3 = 2 THEN SUBSTRING(@RoutingNumber,t.N,1)*1 --Digits 3,6
                            
END AS DigitVal
                        
FROM dbo.Tally t --See http://www.sqlservercentral.com/scripts/Advanced+SQL/62486/
                      
WHERE t.N <= 8
                    
) mv
            
)
        
THEN 'Valid'
        
ELSE 'Not Valid'
        
END
go




--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
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Your snippet does not validate the routing number "111000960" -- or any other number I tried ending in 0. In this case, it rerturns 10 not 0.

So this seemed to work:


;WITH numbers AS ( select NUMBER as n from dbo.F_TABLE_NUMBER_RANGE(1,9) )
SELECT @isValid = CASE
WHEN LEN(@RoutingNumber)=9
AND @RoutingNumber NOT LIKE '%[^0-9]%' --Check to make sure is all digits
AND RIGHT(@RoutingNumber ,1) = right((
--==== Calculates check digit (Digit 9)
SELECT 10-SUM(mv.DigitVal)%10 --Sum of individual digit values subtracted for new number ending in 0
FROM (--==== Gets multiplied value for each digit in 3, 7, 1 pattern
SELECT CASE
WHEN (t.N-1)%3 = 0 THEN SUBSTRING(@RoutingNumber,t.N,1)*3 --Digits 1,4,7
WHEN (t.N-1)%3 = 1 THEN SUBSTRING(@RoutingNumber,t.N,1)*7 --Digits 2,5,8
WHEN (t.N-1)%3 = 2 THEN SUBSTRING(@RoutingNumber,t.N,1)*1 --Digits 3,6
END AS DigitVal
FROM numbers as t
WHERE t.N <= 8
) as mv
),1)
THEN 1
ELSE 0
END


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