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BETWEEN a hard place and a rock


BETWEEN a hard place and a rock

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Hugo Kornelis
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Comments posted to this topic are about the item BETWEEN a hard place and a rock


Hugo Kornelis, SQL Server MVP
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Lokesh Vij
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Interesting question.....completely missed and gone off-track, feeling like "pressed between the hard place and rock" :-)

~ Lokesh Vij

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Danny Ocean
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Lokesh Vij (6/11/2013)
Interesting question.....completely missed and gone off-track, feeling like "pressed between the hard place and rock" :-)



+1 :-)

Thanks
Vinay Kumar
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Ford Fairlane
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very "nasty" question missed it all together - lost in translation - between computer screen and my brain :p

Hope this helps...

Ford Fairlane
Rock and Roll Detective





Igor Micev
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Wonderful!
Regards,
IgorMi

Igor Micev,
SQL Server developer at Seavus
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Thanks for the nice question with plenty of knowledge involved, but I've got it just because none of the above made sense for me, and the explanation is not 100% correct as even if we have 5 Null values in the table, the operator EXCEPT will act as explained in BOL:

EXCEPT returns any distinct values from the left query that are not also found on the right query.

So it will never ever return 5 rows, if NULL values come to play, there will be just one row with NULL value in it.


declare @t table (numericColumn int)

insert into @t values (-10)
insert into @t values (-9)
insert into @t values (-8)
insert into @t values (-7)
insert into @t values (-6)
insert into @t values (-5)
insert into @t values (-4)
insert into @t values (-3)
insert into @t values (-2)
insert into @t values (-1)
insert into @t values (0)
insert into @t values (1)
insert into @t values (2)
insert into @t values (3)
insert into @t values (4)
insert into @t values (5)
insert into @t values (6)
insert into @t values (null)
insert into @t values (null)
insert into @t values (null)
insert into @t values (null)
insert into @t values (null)

SELECT *
FROM @t
EXCEPT
SELECT *
FROM @t
WHERE NOT (NumericColumn BETWEEN -1 AND -10);



Cheers
Hugo Kornelis
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raulggonzalez (6/12/2013)
Thanks for the nice question with plenty of knowledge involved, but I've got it just because none of the above made sense for me, and the explanation is not 100% correct as even if we have 5 Null values in the table, the operator EXCEPT will act as explained in BOL:

EXCEPT returns any distinct values from the left query that are not also found on the right query.

So it will never ever return 5 rows, if NULL values come to play, there will be just one row with NULL value in it.

Good point, and maybe I should have included that in my explanation.
What you forget, though, is that EXCEPT applies the distinct algorithm to the entire result of the SELECT. And I think it's safe to assume that the table has more columns than just the NumericColumn used in the BETWEEN. In your repro, if you add a second column and make sure it has different values in the five rows with a NULL in NumericValue, you'll get 5 rows returned.


Hugo Kornelis, SQL Server MVP
Visit my SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis
Hugo Kornelis
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Ford Fairlane (6/12/2013)
very "nasty" question missed it all together - lost in translation - between computer screen and my brain :p

Thanks! (Goes for the other replies as welll).

I was aware that this is a nasty question. I deliberately picked a title that at least gives a hint about the most nastiest incorrect answer.


Hugo Kornelis, SQL Server MVP
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More proof that one should not attempt QOTD before the morning dose of caffeine.
Danny Ocean
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batgirl (6/12/2013)
More proof that one should not attempt QOTD before the morning dose of caffeine.

Great one :-D

Thanks
Vinay Kumar
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