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mister.magoo

SSC-Forever

Points: 47174
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August 7, 2013 at 9:21 pm

#276737

Comments posted to this topic are about the item Expressions
MM

select geometry::STGeomFromWKB(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james.of.rivendell SSC-Addicted Points: 425 More actions · Answer 1

Moral of today's question. Be careful when using indeterministic functions inside nullif...

Vinay Kumar SSCertifiable Points: 6099 More actions · Answer 2

:Whistling: i have taken more time to answer this and learn something new.

Thanks MM

Thanks
Vinay Kumar
-----------------------------------------------------------------
Keep Learning - Keep Growing !!!

Koen Verbeeck SSC Guru Points: 259115 More actions · Answer 3

Very nice question. Thanks.

Need an answer? No, you need a question
My blog at https://sqlkover.com.
MCSE Business Intelligence - Microsoft Data Platform MVP

SQLWinther SSCertifiable Points: 6294 More actions · Answer 4

Nice "tricky" question! Thank you!

/Håkan Winther
MCITP:Database Developer 2008
MCTS: SQL Server 2008, Implementation and Maintenance
MCSE: Data Platform

kapil_kk SSC-Insane Points: 21316 More actions · Answer 5

Koen Verbeeck (8/7/2013)
Very nice question. Thanks.

+1 🙂

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mickyT SSChampion Points: 10360 More actions · Answer 6

mickyT

SSChampion

Points: 10360

August 8, 2013 at 1:12 am

#1639635

Nice question thanks

ok181ko SSC Rookie Points: 35 More actions · Answer 7

How about

newid() = '00000000-0000-0000-0000-000000000000'

The question is not correct. Answer is 0 (zero).

Carlo Romagnano SSC-Insane Points: 22680 More actions · Answer 8

Very good explanation!

Here is why the first select may return 1,-1,negative and the second only 1 and negative.

The same side effect of "C" macros:

#define abs(a) (a < 0? a*-1: a )

int a = 1;

print("Result %d",abs(++a));

Result 3

select

isnull(

nullif( convert( varchar, sign( checksum( upper(newid()) ) ) ), '-1' )

, 'negative'

)

declare @U uniqueidentifier = newid()

select

isnull(

nullif( convert( varchar, sign( checksum( @U ) ) ), '-1' )

, 'negative'

)

go 10

paul.knibbs SSCoach Points: 15320 More actions · Answer 9

ok181ko (8/8/2013)
How about
newid() = '00000000-0000-0000-0000-000000000000'
The question is not correct. Answer is 0 (zero).

The question asked which of the answers were possible outputs of the statement. It never stated that *all* of the possible outputs were listed as answers. Plus, is it even possible for NEWID() to return a value that's all zeroes?

Michael Riemer SSCertifiable Points: 5190 More actions · Answer 10

Definitely learnt something new today! Was very confused at first but a great explanation too - makes it simple. - Thanks.

Michael_Garrison Hall of Fame Points: 3110 More actions · Answer 11

Dang It! Did it again. I did NOT get my coffee before answering the question. Thus, missed it again. Good question.

Hugo Kornelis SSC Guru Points: 64790 More actions · Answer 12

Good question!

*kicks self* - I knew this, have been bitten by it before, and STILL managed to get it wrong. Obviously need to be bittenn a lot more before it finally sinks in enough that I don't forget about it anymore... 😉

Hugo Kornelis, SQL Server/Data Platform MVP (2006-2016)
Visit my SQL Server blog: https://sqlserverfast.com/blog/
SQL Server Execution Plan Reference: https://sqlserverfast.com/epr/

Mark Cowne One Orange Chip Points: 26954 More actions · Answer 13

Nice question, definitely learned something new.

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Deja View - The strange feeling that somewhere, sometime you've optimised this query before

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