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INTERSECT 2
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INTERSECT 2
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bitbucket-25253
bitbucket-25253
Posted Monday, June 18, 2012 8:55 PM
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Comments posted to this topic are about the item
INTERSECT 2
If everything seems to be going well, you have obviously overlooked something.
Ron
Please help us, help you -before posting a question please
read
Before posting a performance problem please
read
Post #1317704
vk-kirov
vk-kirov
Posted Tuesday, June 19, 2012 12:29 AM
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Thanks for the question.
There is one thing not mentioned in the explanation, but very important to keep in mind: the INTERSECT statement and the SELECT #4 do not always return the same results. If both tables #A and #B contain NULL values, the INTERSECT statement will return a NULL value in the result set, while the SELECT #4 won't.
This behavior is documented in Books Online (
http://msdn.microsoft.com/en-us/library/ms188055.aspx
)
EXCEPT and INTERSECT (Transact-SQL)
Remarks
When you compare rows for determining distinct values, two NULL values are considered equal.
Post #1317741
Vera-428803
Vera-428803
Posted Tuesday, June 19, 2012 1:42 AM
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there is no GO after creation of table #B. In my opinion the select statements will fail with an error.
I didn't try it out but that's what I suspect.
Vera
Post #1317758
Koen Verbeeck
Koen Verbeeck
Posted Tuesday, June 19, 2012 2:14 AM
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Nice question, thanks. And thanks to vk-kirov for the remark.
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Post #1317767
Koen Verbeeck
Koen Verbeeck
Posted Tuesday, June 19, 2012 2:27 AM
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Vera-428803 (6/19/2012)
there is no GO after creation of table #B. In my opinion the select statements will fail with an error.
I didn't try it out but that's what I suspect.
Vera
I think the statements will run just fine.
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Post #1317772
Richard Warr
Richard Warr
Posted Tuesday, June 19, 2012 2:41 AM
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All looked good to me - thanks for the question!
Any ideas on the performance differences between the INTERSECT and INNER JOIN methods?
Post #1317781
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
Posted Tuesday, June 19, 2012 3:17 AM
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Good question, thanks Ron
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All limits henceforth are self-imposed.
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Post #1317803
marlon.seton
marlon.seton
Posted Tuesday, June 19, 2012 3:48 AM
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Richard Warr (6/19/2012)
All looked good to me - thanks for the question!
Any ideas on the performance differences between the INTERSECT and INNER JOIN methods?
I suspect the explain plans and performance will be identical.
Post #1317833
codebyo
codebyo
Posted Tuesday, June 19, 2012 4:00 AM
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Great back-to-basics question and I got it wrong because I wasn't paying enough attention. Err...
I think there is a copy and paste mistake in SELECT #2 and SELECT #3 as both are the same code. I guess you meant one LEFT JOIN with the DISTINCT and the other without it, right?
BTW, thank you for the link with the article.
Best regards,
Andre Guerreiro Neto
Database Analyst
http://www.softplan.com.br
MCITPx1/MCTSx2
Post #1317844
Mighty
Mighty
Posted Tuesday, June 19, 2012 4:01 AM
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I might overlook something, but aren't option 2 and 3 the same?
Post #1317845
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