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SELECT FUN
35 posts, Page 4 of 4
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SELECT FUN
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Steve Jones - SSC Editor
Steve Jones - SSC Editor
Posted Tuesday, May 05, 2009 9:22 AM
SSC-Dedicated
Group: Administrators
Last Login: Yesterday @ 3:30 PM
Points: 31,436,
Visits: 13,751
When a question is ambiguous and I've (usually) been chastised properly by Hugo for letting it slip through, I correct the question and then award everyone who has answered to that time, a correct mark. With points added back.
Follow me on Twitter:
@way0utwest
Forum Etiquette: How to post data/code on a forum to get the best help
Post #710361
Saurabh Dwivedy
Saurabh Dwivedy
Posted Thursday, May 07, 2009 9:10 PM
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Group: General Forum Members
Last Login: Thursday, January 05, 2012 2:05 AM
Points: 488,
Visits: 335
I got it wrong because I thought TWO NULL Values are NOT supposed to be same(identical). So I chose the option with 3 rows. Quirk of SQLServer?
Saurabh Dwivedy
___________________________________________________________
My Blog:
http://tinyurl.com/dwivedys
For better, quicker answers, click on the following...
http://www.sqlservercentral.com/articles/Best+Practices/61537
Be Happy!
Post #712575
Hugo Kornelis
Hugo Kornelis
Posted Friday, May 08, 2009 2:12 AM
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Last Login: Today @ 3:21 AM
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saurabh.dwivedy (5/7/2009)
I got it wrong because I thought TWO NULL Values are NOT supposed to be same(identical). So I chose the option with 3 rows. Quirk of SQLServer?
No quirk. Expected behaviour, as required by the ANSI standard.
NULL values are considered to yield "unknown" (not false!) on any comparison predicate, so they are neither equal nor unequal. But that does not apply here. This is a grouping operation, and the ANSI standard explicitly states that NULL values are considered to be not distinct for grouping purposes.
Hugo Kornelis, SQL Server MVP
Visit my SQL Server blog:
http://sqlblog.com/blogs/hugo_kornelis
Post #712706
Saurabh Dwivedy
Saurabh Dwivedy
Posted Friday, May 08, 2009 2:20 AM
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Last Login: Thursday, January 05, 2012 2:05 AM
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Hugo Kornelis (5/8/2009)
saurabh.dwivedy (5/7/2009)
I got it wrong because I thought TWO NULL Values are NOT supposed to be same(identical). So I chose the option with 3 rows. Quirk of SQLServer?
No quirk. Expected behaviour, as required by the ANSI standard.
NULL values are considered to yield "unknown" (not false!) on any comparison predicate, so they are neither equal nor unequal. But that does not apply here. This is a grouping operation, and the ANSI standard explicitly states that NULL values are considered to be not distinct for grouping purposes.
Thanks. Appreciate it.
Saurabh Dwivedy
___________________________________________________________
My Blog:
http://tinyurl.com/dwivedys
For better, quicker answers, click on the following...
http://www.sqlservercentral.com/articles/Best+Practices/61537
Be Happy!
Post #712710
Abi Chapagai
Abi Chapagai
Posted Friday, December 24, 2010 8:47 AM
SSCommitted
Group: General Forum Members
Last Login: Sunday, May 19, 2013 10:45 AM
Points: 1,786,
Visits: 1,006
Hugo,
I agree with your points. I did select wrong answer but it is a good learning experience and i did not know that order by in UNION would make a difference. I had the impression that UNION would not take the nulls like UNION ALL. Thanks for the clarifying it.
Post #1039124
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