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Hi Guys,
I have a table with a column which is VARCHAR. This column has text and potentially Credit Card # and also has couple of dates. What I need to do is find all the records that may potentially have CC# in this column... I was thinking of using something like
WHERE patindex('%[09][09 ][09 ][09 ][09 ][09 ][09 ][09 ][09 ][09 ][09 ][09 ][09 ]%',Memo) > 0
patindex('%[09][09 ][09 ][09 ][09 ][09 ][09 ][09 ][09 ][09 ][09 ][09 ][09 ]%',Memo) > 0
Is there a better way to look for numbers in the string that may potentially be CC#. It is fine if some of them are not CC#. Maybe someone has already worked on a function like this where you find CC# from a string... Any help is appreciated. I am not looking for CLR function though as I have to do this using Query Analyzer.
Thanks, Laura




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Laura i think it would be easier to delete dashes, and maybe also spaces from the string, and then look for 16 [09] digits in a row in the remaining string. (or 15 amex number?); i saw your previous post, but now that it has percolated a bit, i'm thinking you need to manip the comment bit first to make the search easier
Lowell
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That seems like a reasonable approach. Using REPLICATE() will make it easier to see how many numbers are in the pattern and/or adjust it later:
WHERE PATINDEX('%[09]' + REPLICATE('[09 ]', 12) + '%', Memo) ...
SQL DBA,SQL Server MVP('07, '08, '09) "In America, every man is innocent until proven broke!" Brant Parker




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Laura_SqlNovice (3/29/2013)
Hi Guys, I have a table with a column which is VARCHAR. This column has text and potentially Credit Card # and also has couple of dates. What I need to do is find all the records that may potentially have CC# in this column... I was thinking of using something like WHERE patindex('%[09][09 ][09 ][09 ][09 ][09 ][09 ][09 ][09 ][09 ][09 ][09 ][09 ]%',Memo) > 0 Is there a better way to look for numbers in the string that may potentially be CC#. It is fine if some of them are not CC#. Maybe someone has already worked on a function like this where you find CC# from a string... Any help is appreciated. I am not looking for CLR function though as I have to do this using Query Analyzer. Thanks, Laura
Do you actually want to extract the numbers (even if more than one in a row) or are you just trying to isolate the rows using the WHERE clause?
Jeff Moden "RBAR is pronounced "reebar" and is a "Modenism" for "RowByAgonizingRow".
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."
(play on words) "Just because you CAN do something in TSQL, doesn't mean you SHOULDN'T." 22 Aug 2013
Helpful Links: How to post code problems How to post performance problems




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i'm afraid this task isn't as easy as it may sound. The difficulty comes from the complexity of credit card number formulation. Now let's assume we just want to find the most common cards AMEX, MasterCard, Visa, Discover, Carte Blanche/Diners Club and perhaps a few others. Even among just these major carriers the rules are different. For example, AMEX numbers are 15 chars, MasterCard 16, Visa 13 or 16, Discover 16, and CBDC is 14.
Then there is the Issuer Identification Number (IIN) which varies from one digit (Visa) to as many as 6 digits (Discover). These IINs have changed over the years so there are many different ranges of digits for just about every type of card. These ranges can be looked up and put into a table to be used for CC validation.
And there's more...the last number of every card number is a checksum digit calculated by the Luhn Algorithm which is public domain. Virtually all cards use the Luhn Algorithm for the checksum.
So...just finding sets of 15 or 16 digits won't tell you whether it's likely to be a credit card number at all, much less if it's might be a valid card. A number can be wellformed and have a proper checksum and still not be valid if it's been retired or never issues for example. So all we can do is weed out numbers that break the rules. The rest can only be confirmed by the card issuer and that's another can of worms.
I've dug out some functions I had for validating card numbers and made a few adaptations to make them suitable for using as an example.
Function 1 is just a version of DelimitedSplit8K that splits EVERY character. Jeff Moden deserves most of the credit.
CREATE FUNCTION [dbo].[DelimitedSplit8KByChar] (@pString VARCHAR(8000)) RETURNS TABLE WITH SCHEMABINDING AS RETURN WITH E1(N) AS ( SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 ), 10E+1 or 10 rows E2(N) AS (SELECT 1 FROM E1 a, E1 b), 10E+2 or 100 rows cteTally(N) AS (SELECT 0 UNION ALL SELECT TOP (DATALENGTH(ISNULL(@pString,1))) ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E2 ) SELECT ItemNumber = ROW_NUMBER() OVER(ORDER BY t.N), Item = SUBSTRING(@pString,t.N+1,1) FROM cteTally t WHERE NULLIF(SUBSTRING(@pString,t.N+1,1),'') IS NOT NULL GO
Function 2 parses the CC number and compares it to a table of Issuer Identification Number ranges. THIS IS ONLY A SAMPLE AND MUST BE UPDATED WITH OFFICIAL ISSUER DATA BEFORE USING IN PRODUCTION!!
CREATE FUNCTION [dbo].[itvfGetCCIIN] ( @CCNum VARCHAR(50), @CCLen INT ) RETURNS TABLE WITH SCHEMABINDING AS RETURN WITH cteIINValue(ID,CCType,StartIIN,EndIIN,CCLen) AS ( SELECT ID,CCType,StartIIN,EndIIN,CCLen FROM (VALUES (1,'American Express',34,34,15) ,(2,'American Express',37,37,15) ,(3,'Diners Club',300,305,14) ,(4,'Carte Blanche',300,305,14) ,(5,'enRoute',2014,2014,15) ,(6,'enRoute',2149,2149,15) ,(7,'MasterCard',51,55,16) ,(8,'Visa',4,4,13) ,(9,'Visa',4,4,16) ,(10,'Discover',6011,6011,16) ,(11,'Discover',622126,622925,16) ,(12,'Discover',644,649,16) ,(13,'Discover',65,65,16) ,(14,'JCB',3528,3589,16) ) AS Data (ID,CCType,StartIIN,EndIIN,CCLen) ), E1(N) AS ( SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 ), 10E+1 or 10 rows E2(N) AS (SELECT 1 FROM E1 a, E1 b), 10E+2 or 100 rows E4(N) AS (SELECT 1 FROM E2 a, E2 b), 10E+4 or 10,000 rows max E8(N) AS (SELECT 1 FROM E4 a, E4 b), 10E+6 or 100,000,000 rows max cteTally(N) AS (SELECT 0 UNION ALL SELECT TOP (SELECT ISNULL(MAX(EndIIN),10000) FROM cteIINValue) ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E8 ) SELECT ID ,IINType ,CCIIN ,IINLen ,StartIIN ,EndIIN ,CCLen ,Prefix FROM ( SELECT ROW_NUMBER() OVER (ORDER BY t.N) AS ID ,cte.ID AS IINID ,CCType AS IINType ,N AS CCIIN ,CCLen AS IINLen ,StartIIN ,EndIIN ,@CCLen AS CCLen ,(CASE WHEN ISNUMERIC(@CCNum) = 1 AND CONVERT(BIGINT,LEFT(@CCNum,LEN(t.N))) BETWEEN StartIIN and EndIIN THEN CONVERT(BIGINT,LEFT(@CCNum,LEN(t.N))) ELSE 0 END) AS Prefix FROM cteIINValue cte CROSS APPLY cteTally t WHERE t.N BETWEEN StartIIN and EndIIN ) r WHERE 1=1 AND r.CCIIN = r.Prefix AND r.Prefix > 0 AND r.IINLen = r.CCLen
GO
Function 3 is the Luhn Algorithm for getting the checksum.
CREATE FUNCTION [dbo].[tvfLuhnValidation] ( @CCStr VARCHAR(100) ) RETURNS @CheckSumValidation TABLE ( ID INT IDENTITY(1,1) NOT NULL, CCNum VARCHAR(20) NULL, CkSumRemainder INT NULL, PRIMARY KEY (ID) ) WITH SCHEMABINDING AS BEGIN
DECLARE @CCNum BIGINT ,@CheckIIN BIT ,@AllDigits BIGINT ,@ReverseDigits BIGINT ,@CheckSum BIGINT ,@CheckSumRemainder INT
SET @CCStr = REPLACE(REPLACE(@CCStr,' ',''),'','')
IF PATINDEX('%[^09]%',@CCStr) > 0 BEGIN INSERT INTO @CheckSumValidation (CCNum,CkSumRemainder) SELECT 0,99 END ELSE BEGIN
SET @CCNum = CONVERT(BIGINT,@CCStr) SET @AllDigits = @CCNum SET @CheckSum = CAST(RIGHT(@AllDigits,1) AS BIGINT) SET @ReverseDigits = RIGHT(REVERSE(@AllDigits),LEN(@AllDigits)1)
/* Get the check digit using the Luhn Algorithm */ ;WITH cteCheckSum AS ( SELECT (SUM(Item)+@CheckSum)%10 AS CheckSumRemainder FROM ( SELECT s2.ItemNumber ,CAST(s2.Item AS BIGINT) AS Item FROM dbo.DelimitedSplit8KByChar(@ReverseDigits) AS s1 OUTER APPLY dbo.DelimitedSplit8KByChar(s1.Item*2) AS s2 WHERE s1.ItemNumber%2 <> 0 UNION ALL SELECT ItemNumber ,CAST(Item AS BIGINT) AS Item FROM dbo.DelimitedSplit8KByChar(@ReverseDigits) WHERE ItemNumber%2 = 0 ) d ) INSERT INTO @CheckSumValidation (CCNum,CkSumRemainder) SELECT @CCNum AS CCNum ,CheckSumRemainder FROM cteCheckSum cs
END
RETURN
END GO
Last but not least is some script to tie all these functions together. It's not the swiftest code because a lot is going on internally and I'm sure someone (as always!) will be able to offer improvements.
WITH cteSampleData replace this with your real data AS ( SELECT * FROM (VALUES (1,'VISA','4012888888881881','10/14') ,(2,'MasterCard','5269924854210552','06/15') ,(3,'Voyager','869994992762272','08/14') ,(4,'VISA','4539390243132435','12/15') ,(5,'enRoute','214992938007085','09/13') ,(6,'VISA','4485983356242218','11/14') ,(7,'JCB','3088518677707770','01/14') ,(8,'VISA','4532254137583730','07/14') ,(9,'JCB','3560777438925512','12/15') ,(10,'Discover','6011618612311087','11/14') ,(11,'VISA','4417123456789113','07/15') ,(12,'Diners Club','3022329080952x','12/13') ) AS Data (ID,CCType,CCNum,CCExp) ) SELECT * FROM cteSampleData SELECT r2.ID ,(CASE WHEN r2.CCNum IN (0,1) OR r2.CCNum IS NULL THEN CAST(r2.OrigCCNum AS VARCHAR(50)) ELSE CAST(r2.CCNum AS VARCHAR(50)) END) AS CCNum ,r2.IINType AS ProbableCardType ,(CASE WHEN v.CkSumRemainder = 0 THEN 'OK' WHEN r2.CCNum IN (0,1) OR r2.CCNum IS NULL THEN 'Invalid Number' ELSE 'Invalid CheckSum' END) AS CardNumberStatus FROM ( SELECT cte1.ID ,(CASE WHEN cte1.CCNum IS NULL THEN 0 WHEN PATINDEX('%[^09]%',cte1.CCNum) > 0 THEN 1 ELSE CAST(cte1.CCNum AS BIGINT) END) AS CCNum ,cte1.CCNum AS OrigCCNum ,(CASE WHEN r1.IINType IS NOT NULL THEN r1.IINType ELSE 'Unknown' END) AS IINType FROM cteSampleData cte1 LEFT OUTER JOIN ( SELECT DISTINCT ROW_NUMBER() OVER (PARTITION BY r.ID ORDER BY r.ID) AS CCNumGroup ,r.ID ,r.CCNum ,iin.IINType FROM ( SELECT cte.ID ,cte.CCNum ,LEN(cte.CCNum) AS CCLen FROM cteSampleData cte ) r CROSS APPLY dbo.itvfGetCCIIN(r.CCNum,r.CCLen) iin ) r1 ON cte1.ID = r1.ID WHERE CCNumGroup = 1 OR CCNumGroup IS NULL ) r2 CROSS APPLY dbo.tvfLuhnValidation(r2.CCNum) AS v ORDER BY ID




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Yes Jeff I just need to isolate those row... I do not need to find the numbers. I will go through the response from everyone now. Thanks a lot to everyone in taking to respond to this. Yeah somehow my earlier post was deleted... may be they thought I had put actual CC# in the script I had... Or I might have done something wrong while creating the post. Thanks Steven for the scripts.



