Error validating check constraint sql server

The mathematics behind such a proof is spectacularly complex.

Fortunately for us, since I am no mathematician, we will focus on the more mundane aspect of calculating check digits using some known, good algorithms that have been invented by those much smarter than me.

For this and other check digit algorithms, you should make sure you’re familiar with the T-SQL operator (%) for modulo (remainder upon division).You can see from the example code how it can be called.Because it returns a table, it can also be referenced in a CROSS APPLY in case you need to perform this same validation across many rows.This tally table construct will work in SQL 2008 or later, but if you need to use a Tally table in an earlier version of T-SQL, you can consult the linked article for numerous examples.Using LEN(@Check String) in the TOP clause of the SELECT ensures we only return one row for each character in our string, i.e., returning no rows with empty strings at the end.

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