As compared to say:
REPLICATE(@padchar, @len - LEN(@str)) + @str As compared to say: REPLICATE(@padchar, @len – LEN(@str)) + @str
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This is simply an inefficient use of SQL, no matter how you do it.
perhaps something like
where X is your padding character and @n is the number of characters in the resulting string (assuming you need the padding because you are dealing with a fixed length).
But as I said you should really avoid doing this in your database.