in reply to Datatypes. A Perl T-SQL comparison

Not that this is a perl question, but if your string contains only numbers, you should be able to do an implicit conversion. Observe: 
declare @var nvarchar(3)
set @var='123'

select @var-10

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thor

Feel the white light, the light within
Be your own disciple, fan the sparks of will
For all of us waiting, your kingdom will come

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