There might be some system that requires a 4 digit number and the PK is being used directly. Also, this same system might need to be exported to Excel, which trims leading zeros and is generally a pain in the ass.

Peter Westergaard wrote:

I've done exactly this for a really cheap-and-dirty instance where two
people were doing bulk data entry into two different instances of a mysql
table which would eventually be stitched together.  by giving one a higher
range, the data migration afterwords was very easy.

Other than that, can't imagine a use for this approach.


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