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zPad() - add leading zeros to a number

By Don Frazier,

This user-defined function converts a number to character format and adds leading zeroes to pad the field to a specified length.  useful for displaying SSNs or other numeric fields where the leading 0's are significant but the field is stored as numeric.

To use:
select dbo.zPad(, )

make sure your length includes an extra column for the sign.  If you format an SSN, length = 10.

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