Moral of today's question. Be careful when using indeterministic functions inside nullif...
That's not the only place this can happen of course...
newid() = '00000000-0000-0000-0000-000000000000'
The question is not correct. Answer is 0 (zero).
SQL Server will not produce that value from the NEWID() function as it outputs type 4 uuids, where the first digit of the third section is always "4"
However, I do concede that the checksum could possibly produce a zero for one or more guid values, at least I have no evidence to say it will not, so thanks for pointing out that zero may be a valid value as well.
The intention was to educate about the behaviour rather than about the possible values, so I think it still works on that level 🙂
Thanks for the nice feedback, I did try hard to make this question useful and informative, so it is pleasing to hear that so many of you enjoyed it. 🙂
select geometry::STGeomFromWKB(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