Interesting article, as usual, but that class="code" style trashes the page, making it unreadable, please correct it! thanks

The last part of the third query must be THEN 1 ELSE 0 in order to work properly:

declare @DateOfBirth datetime

set @DateOfBirth = '31/07/1960'

select DATEDIFF(yy, @DateOfBirth, GETDATE())

select FLOOR(CONVERT(decimal(9, 2), DATEDIFF(d,...