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The Luhn Algorithm in SQL

The Luhn test is used by most credit card companies to check the basic validity of a credit card number. It is not an anti-fraud measure but a quick check on data corruption. It still allows any digits that are odd or even to be switched in the sequence. Most credit cards are compatible with Luhn algorithm. It is often applied to SSNs, company organization numbers, and OCR numbers for internet payments. How do you handle them in SQL?

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Simple Talk now uses Redgate ID

If you already have a Redgate ID (RGID), sign in using your existing RGID credentials. If not, you can create one on the next screen.

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