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SELECT FUN


SELECT FUN

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Steve Jones
Steve Jones
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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.

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Saurabh Dwivedy
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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
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Hugo Kornelis
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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
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Saurabh Dwivedy
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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!
Abi Chapagai
Abi Chapagai
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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.
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