Checksums can be very helpful for validating that data is intact and free from simple mistakes. They are extremely fast to calculate, and computing power has made them all but trivial over the past few decades. Because of this, checksums often hide in plain sight. One of these is the Luhn Checksum, which is produced by …

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Whether you are working in T-SQL, Oracle, MySQL, C#, or Java, the range of possible values for a signed (positive or negative) 32-bit integer is fromor (-2,147,483,648) to or (2,147,483,647). The fact that it's so consistent across so many different platforms (and also against plenty of others I didn't list) means …

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