Don't know where to start, possibly EF choice of geography as varbinary(max) or XML as nvarchar(max). Other peculiarities would be Currency Exchange Rates as int, Social Security Number as datetime, phone number as decimal with the fraction as the extension, ISO-3166-2 and ISO-4217 as nvarchar(max), email addresses as varchar(25), dates as varbinary etc.. And of course not to mention any default conversion from Excel or Access!

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