What is (Null='Hello') in Sql Server

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What is (Null='Hello') in Sql Server

JaimePC

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March 26, 2014 at 10:33 pm

#287038

Comments posted to this topic are about the item What is (Null='Hello') in Sql Server
March 27, 2014 at 3:01 am

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HeliMan SSC Journeyman Points: 99 More actions · Answer 1

I get the explanation for why 5 does not show up. Is that the same reason 2 also doesn't show up? My guess was 2, 4, and 5.

There is only one truth

Andreas P. Williams SSCrazy Points: 2487 More actions · Answer 2

The answer is only correct is ANSI_NULLS is ON. With ANSI_NULLS off one obtains 2,4,5.

Roland C Hall of Fame Points: 3473 More actions · Answer 3

mikesyd (3/26/2014)
I get the explanation for why 5 does not show up. Is that the same reason 2 also doesn't show up? My guess was 2, 4, and 5.

Yes, it's the same reason. By the fact, "A <> B" and "not(A=B) are strictly identical.

Koen Verbeeck SSC Guru Points: 259075 More actions · Answer 4

Nice question, thanks.

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BrainDonor SSCoach Points: 19250 More actions · Answer 5

An interesting question but I do think it should specify the ANSI_NULLS setting, as the answer depends upon that.

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danielfountain SSCarpal Tunnel Points: 4229 More actions · Answer 6

Am I the only one who thinks that is the expected behaviour?

With default SQL settings...

You cant ask if something = null and expect to get the correct answer. So why would you expect NOT(something =null) to work?

Toreador SSChampion Points: 11333 More actions · Answer 7

danielfountain (3/27/2014)
Am I the only one who thinks that is the expected behaviour?

No. I almost guessed something different as these questions very rarely have the obvious option as the answer - particularly since the question said that this was somehow 'unusual'. But I couldn't manage to make any of the others fit, so went for the obvious choice and got it right.

Ed Wagner SSC Guru Points: 287024 More actions · Answer 8

Stewart "Arturius" Campbell (3/27/2014)
Interesting question with some interesting red herring answers.
Thanks, Jaime

+1 on the red herring answers. Nice question.

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tabinsc SSCommitted Points: 1812 More actions · Answer 9

Important to know the mechanics of null values. Thanks for the question!

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Sean Lange SSC Guru Points: 286573 More actions · Answer 10

Nice question about a basic concept that many people don't understand. Given that at the time of post there are 30% wrong answers it seems this is something that many people need to look at.

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sestell1 SSChampion Points: 10230 More actions · Answer 11

Sean Lange (3/27/2014)
Nice question about a basic concept that many people don't understand. Given that at the time of post there are 30% wrong answers it seems this is something that many people need to look at.

+1

I'm surprised how many people fear null values because they don't understand them, which is a shame as they can be quite useful once you understand their behavior.

PChiragS SSCarpal Tunnel Points: 4965 More actions · Answer 12

PChiragS

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March 27, 2014 at 7:39 am

#1700675

nice question..

thanks jaime.

SQLRNNR SSC Guru Points: 281324 More actions · Answer 13

Intriguing question. I enjoyed it. Thanks

Jason...AKA CirqueDeSQLeil
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